Step 4: Click First Aid on the top. It will show you what errors it has found. Fixing "The volume Macintosh HD was found corrupt and needs to be repaired" error in Recovery Mode will take a while and only needs to be done once. After Macintosh HD volume corruption repaired, you can restart your Mac successfully. If the corrupted Macintosh HD volume could not be repaired in Recovery Mode, you need to repair it by reformatting and then reinstall operating system. Before that, make sure you have a backup of the files on the Macintosh HD drive. Or alternatively, you can recover lost data from Macintosh HD with reliable data recovery software.
It is the best free Mac data recovery software that supports macOS Mojave Install operating system on an external drive, like USB drive, and then boot your Mac from it. Preview the searching results, choose files you want to get back, and click "Recover".
Step 2: Reformatting corrupted Macintosh HD. Restart the Mac into Recovery Mode. After reinstallation, the error "The volume Macintosh HD was found corrupt and needs to be repaired" will be solved. If still not, you need to replace this drive with a new one. EN FR. Store current Mac Data Recovery. Windows Data Recovery.
I have managed to get to step 7. I would be eternally grateful for any help you can provide. Thank you so much for your time! I have a similar problem to George Hickman , I enter the numbers just as they are but it tells me they are a bad size. Thank you!!!! I nearly lost 12 years of my work, which I stupidly kept storing for the past 2 years at Iomega external HD without additional backup.
Following your suggestions I managed to get all my data back. On the terminal it mentions that I should be the root user. I assume I am. There are no other drives connected at this time. What can I do to have Testdisk detect the damaged disk? It appears on system profiler. I tried to do exactly what you wrote down. Im having some difficulties though. Some of the messages that appear on the terminal was that the is not writable.
Does that mean everything in my hd has been deleted? Im kinda stuck at there… I still tried using that pdisk command though, since i have the start block and end block values, but when i tried calling for the commands, the commands could not be found.. Thanks for the info.
The first time I ran through the process the screen shots were similar to yours but nothing happened. So I tried again and the following times the testdisk screen showed me more partitions at the beginning, before analyzing the partition partition map, etc. I could still do the steps. Once analyzed and in terminal, the info changed from what it showed in step 8 before. I am working on a 16gb flash drive.
I ejected it from my computer, the icon disappeared from the desktop and then i removed it but when i plugged it in to my laptop i got the error message. Seriously, this was actually soooo easy compared to waiting hours upon hours for those pay-for apps to scan and analyse. T Attribs. After completing the backup, I forgot what the previous setting was and the board re-initialise the pari of Gb disks!
After hours of downloads and testing apps. Bare in mind, if you had spaced in the partition names, you need to enclose it with double-quotes. Thank you again! It worked the first time but half way down entering it I missed a number in the partition start so had to start over..
It makes pretty much the same noises as a healthy drive, nothing out of the ordinary! I put my After the HD thawed, clicking started again.
Is my data recoverable? Thanks for your great tutorial. It worked well for me up until the pdisk part. I tried the gpt command as well, but had the same problem there. I checked to be sure and the disk is not mounted. Great instructions, and extremely helpful in correction a incredibly scary problem corrupted partition table. Your detailed instructions, screenshots, and links to the tools TestDisk were awesome!
I had almost given up as permanently lost or, at least, terribly damaged and leading me towards hundreds of hours of recovery, renaming and restructuring work almost 11 years worth of digital history pictures, music, documents, applications, etc. Amazing tip. So no need to use pdisk anymore. Thankfully I found your post!!!
Thanks a million and once!!! Pulled it off again and the partitions were still there, so we just made a backup copy of all the info and its up for repairs second Mac I know that has the flat cable problem in like two weeks! A great big thanks to you. Macbook pro HD partitions missing after a bios fallout.
Unallocated disk with only 32MB showing in disk utility. Recreated exactly as it was before this barny. So, I tried this. Seriously you have no idea how loudly I am screaming right now. I have a gb seagate external that I had allll my files on from college. I was working on a windows pc at that point. I transferred one folder and all worked well. I later reconnected my device to my mac and it said it could no longer be read. Will this tutorial be a possibility for me with my current mac?
Please add me as another happy user of your methodology. It worked like a charm and this has restored my faith in the Interwebs being a force of good. Merci beaucoup! This worked great, I think! I would just add that I had to modify your instructions a bit. I was trying to recover a 2TB drive with two partitions, and whereas you skipped over the block size prompts in pdisk, I had to change those. I used bytes per block, which seems to have gotten it to work. Can you post a screen shot? I have a 2TB disk with one partition but it starts at with a size of it looks very small to allow the 2TB.
One additional tip: you can have multiple terminal windows open. Just hit cmd-N. I just had to replace a bricked drive and now, even though the array has been rebuilt, OSX can read but not write. Having the same issue. Error starting filesystem repair for disk1: Unrecognized filesystem I have no clue what to do, or how to run the program I download from you first step.
Hi Perro, You are the man! Thanks to you and TestDisk, I was able to repair it with the help of a friend. Saved weeks of work and footage that could have been lost forever. Keep up the good work! Hey Perro! Thanks for this resource. TestDisk 6. Do I need to do it? Do I have the partition information needed to fix it already? Or do I have to go through the search?
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Any help or advice would be greatly appreciated. Hello Perro! Thank you! This worked awesome for me, even restored some partitions that I had deleted a while back! Thanks again. Great page here! Any pointers would be appreciated. Heyy, Thanks for it.. But Now, there is one more problem.. I unmounted and eventually figured out the following from a few interenet searches and held-breath experiments. Unfortunately, while the partition shows up, as it already did before, none of the files are there.
But this is an external disk, so you can plug it to your mac and do almost the same steps using gdisk instead of pdisk you just need to check the the proper commands. You can then cd to one of them or just cd directly — no need to list the volumes first. We were unable to decrypt the certificate id. Oh snap… You made my day with this tutorial. Bless you! I wish you the best man. All of my data is back now. Thanks again! Thank you so much!
I have added your solution to the apple discussion forums at least on my question when all the pros told me that I would have to reformat and reinstall everything…. I wanted to increase the size of my boot camp partition. So your solution basically made my retina mbp bootable again; only two differences. My recovery drive is now displayed, and my Bootcamp partition has disappeared from disk utility however, it still is using the space…leading me to believe the partition map for the Bootcamp partition is shot.
So thank you very much sir!! Try this. On my terminal, the command prompt starts with machine name, and looks like. The first thing is what you call your machine, if you named it. It may have a default name, I never pay attention to those.
Mac Can’t Repair External Hard Drive. How to Resolve?
You will likely see no change, as it should boot up with your home directory as the working directory. Which is fine for our purposes. Hit and you will be in your downloads directory. To quickly go up one level type:. Man, you are a Genioussssss!!!!! Saved my Neck!!!! I am donating of course!!!!!
TestDisk found the original partition. But if this is an external disk, you can plug it on your mac and do almost the same steps using gdisk instead of pdisk you just need to check the the proper commands. After much trouble along the lines of many here because my disk uses GPT and not APM I downloaded the gdisk utility this is a utility that uses fdisk commands — there is no gdisk command. GPT fdisk gdisk version 1. Good luck folks! Parallels was definitely the problem here!! Ok we finally got it to work. We used the instructions from CGsecurity. Step 2 — Drag the testdisk To locate that file in the terminal type.
Thank you so much for posting this and want to reward you for your great efforts!! Please email me when you get a free moment, we have a gift for you!!!!! I screwed up the first time on step Now if you are completely sure you wrote down everything correctly …. It sounds like I had the exact same issue as your example case — preparing to partition SSD in my new fancy schmancy MBP partitioned a little bit of the external disk with, essentially, my whole life on it for the wininstall partition, and then it overwrote the partition table for the entire disk when I was foolishly trusting it to only use the portion I had set aside.
Like your example, I immediately unplugged it all, and started looking for solutions. So, I feel like I am very close to avoiding my appointment at the local Genius Bar by fixing this myself and so being able to cancel, but I am not quite there, and I kind of expect that my affable neighborhood genius is kind of likely to completely fubar this. New response from above was repeated. But if you are fine using. But in your case, if you are fine with only your OSx, then you should just skip the first partition as I said and you should be good to go.
That is great. This week I start work, and will gladly donate once I get my music library back. So far I have not been able to get this to work for me, which seems odd, since I did the exact same thing your friend did, and I have followed the instruction exactly. I had two external drives connected and was about to backup my photos from the last couple of months. I meant to change the partition structure on the backup drive it was previously used for something else and accidentally deleted the partition table on the drive with the photos!! Basically once I found the partition I just told it to write the changes.
I just dded over my external HDD, and found this promising guide. Can you please put up a Dogecoin wallet address to donate to in case this works out? You can read about dogecoin in the link I entered. After following carefully these directions, I keep getting bad size, bad name and requested base and length is not within an existing free partition error messages.
How did you search for the unzipped Test-disk? Got the same problem, a 1. Went crazy at first, and then found your post. This is amazing!!! But Now, there is one more problem acquired.. The Mac OS on Disk 0 is working as normal as before, but when I reboot to install windows, there is no separated spaces, also Mac OS partition, its all united.. If you are using a regular pitch, then place the tea in a T-sac first to make it easier to strain your tea, especially if you are using some kind of herbal tea.
People who make a point to consume foods that contain RGCG keep themselves detoxified. Water has miraculous effect in weight reduction by consuming extra calories and detoxifying body. It most likely has a sector size of Therefore, you have to change the geometry of the drive. You should see something similar to below map already exists may not show up.
Fixing a Broken EFI Partition on Mac
Change physical block, logical block to OMG …. In trying to get the PC to read the disk, I accidentally initialized the drive on the PC thus rewriting the partition. It showed no files whatsoever neither on my PC or my Mac. After step 21, it will show a warning that writing the map destroys what was there before.
I followed the this tutorial for the testdisk portion and the nathanhein. This was pretty straight forward and saved my drive!!!!!! Thank you for this helpful post.
HFS Partition Recovery: Recover HFS, HFS+ Partition Data on Mac  - EaseUS
Daniel suggests changing the Geometry settings for larger drives. The datasheet says this drive is an Advanced Format drive with 4, byte sectors. His example is for Heads, but does any drive really have that many heads? Mazen suggests using gdisk instead of pdisk for GPT disks, which I would think this would be. But more people seem to be reporting success with pdisk, then one would expect given how long Intel Macs have been out. Does this matter? This drive may have had some.
And how do I tell the new partition accidentally put on by Disk Utility from the ones we want to recover? Problem: 3. This post actually made my day. Thanks for this guide. And no need to use pdisk etc. I went through something similar and was able to fix it by doing the following first thought it was Apple partition map then realized it was EFI GPT. I fixed my problem in a slightly different way though. I just used the following commands:.
Excellent post. I was looking for this certain info for a long time. Thank you and good luck. Feel free to visit my blog: birthday party places for kids. I had already tried to do that, but every time I try to do so, I get the annoying spinning bach ball. After I got the new disk, I hooked the damaged disk up to my NAS, and to my deep surprise, it mounted just fine, and the data can be accessed with several limitations.
All the steps I report here or on the Apple site are issued on the damaged disk connected back-to-back to my Mac mini. It looks like Android 4. Hi Perro, I did as you adviced but the result from testdisk is very messy. So I do not know what is next step. Could you please help me. This HDD has all my data.
Thank you very much. Hence, this tool is cheaper than its competitor and achieves high on results. Excellent site. A lot of useful info here. And naturally, thanks on your effort! Then I got this message. VMFS Did you create a new partition table with just 1 table on your disk before attempting this? Like formatting? If you mean, before the breakdown of the hard drive, no. It was working properly, until one day my computer could not find it when I plugged it in. Hi, thanks for the tutorial!
I have but one issue. Thank you. I followed all your instructions, but the only partition I get to work is the new one, which have overwritten the original, so the files are not there. Do you have any idea on how could I get my old partition to be read instead of the one that replaced it?
If anyone feels that they have this down please let me know. It could be done remotely with jabber screen-sharing. This is my last resort before throwing the HD in the garbage. Please let me know. Thank you for the quick reply! Perhaps I am doing it wrong? I am not tech savy, so I can go through the beginning steps with you? If some one needs to be updated with hottest technologies after that he must be go to see this site and be up to date all the time.
Problem is, the hard drive is password protected. So I read later after analyzing:. So just chosing:. The easiest way to launch testdisk is to double click the unix executable in the test disk folder. This has me confused beyond belief! Its in fact remarkable post, I have got much clear idea regarding from this post. You sir a king of kings! One minor clarification. Since it is possible to have 2 or more open terminal windows at the same time, there really is no reason to write anything down.
Your way works as well but my penmanship and ability to accurately transcribe are often called into question! So with 2 windows open, all that you need to do is copy and past. I have never written to thank someone on a website before but I just want to say a very sincere thank you!! This worked and now I will make sure I backup my data more than once ha ha!!
There are still decent people out there looking to help! I am so happy! You are my hero! Do you have any PO Box addres or sth to send a case of beer? Thanks for this. I was so worried but I was able to recover all the files from my external hard drive 1tb with all the filing structure. So if I follow your guide, I do end up with a recovered partition, but disk utility tells me its defective and needs to be erased. What do I need to do? Thanks for the guide and additional help.
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Thanks in advance. One thing I noted that were slightly different than your directions — i was asked to select the partition table type. Came across this blog and you seem like the only one with the right answer. Please Help? Pretty Please? I just wanted to express my sincere gratitude for your awesome tutorial! Is there a way to determine which disk to use? I guess it was maybe the wrong disk.
Then I went into teskdisk again and more options came up than the initial testdisk run. How long does this typically take? Should I continue to let it scan? Your explanation and direction were perfectly clear for someone like me who uses a mac but almost never touches the terminal. I had a GB, 4-year-old Toshiba Canvio drive that recently stopped showing up in Finder I know, shame on me for not backing it up at this point.
Disk utility shows the drive but not the volume. Repair options along with most other functions were grayed out. The drive had only one HFS partition with no human error in operating it as far as I know besides maybe not properly ejecting a couple of times. After following your directions, TestDisk worked beautifully. Some steps did take a while to complete, but immediately afterwards, the drive showed up in its original form under Finer. Can you help me filling in the blanks for pdisk so that I actually add the correct info to the partition table?
However I get the following error in Testdisk. I have a weird problem and it all started after I was finally able to get Windows 10 to upgrade my Windows 7 bootcamp. I thought I had lost everything since Win10 was showing it as entirely unallocated with no partitions on it but booted back into OSX and it all was fine there.
I did use the disk utility to check the disk in OSX and it did say it needed to be repaired so I repaired it and it continued to work correctly in OSX. I thought it had been fixed but back in Win10 it still showed as unallocated, I installed the paragon HFS tool thinking that would fix it but still no go.
Was able to fix it but had to get another drive to transfer my files to. Naturally, I launched Disk Management and it prompted something like use it as a dynamic disk or basic to which I clicked yes like an idiot. After much searching here and there I have realized what just happened. And I followed the steps here. I then hit Enter, it scans through and It keeps going for hours. Did I do something wrong? Use the center to create big tiles, then move them to the corners to combine them with the ones already there.
I did the testdisk scan which gave me this:. TestDisk 7. If you no longer see your familiar volumes in Finder, and newly existing ones appear to be empty or cleared, you might have lost your partitions.
While this may lead to the complete data erasure, if you act fast Disk Drill tool may be able to help you recover lost partitions on your Mac. I was given it to partition for use with OS X and Windows. Now need to find out how to delete the fat32 partition not detected in Windows for some reason and make the drive whole again. The owner can buy another drive for Windows use. Thanks for the good writeup. It in truth was a enjoyment account it.
Glance complicated to more delivered agreeable from you! However, how can we communicate? I am using OSX How can I correct this? AS i have read the comment above , someone say that the block should be bytes, may i know is it relevant? Hi I have a similar issue to the one describe above except it is a SD card which also has most of my life on it and it has a single partition in exFAT.
Can I use the same process to repair the card? Do I need some extra steps to do this? Hello guys! Good luck! Do you need to save the change block size before closing tesdisk and go to pdisk? My analysis in tesdisk is good with but pdisk is still using ;. Thanks Perro! Trying to bring back 4Tb portable Seagate drive. Until disk everything worked. Some Piece of Information. I came to this site like many of the others here trying to find a way to retrieve my precious documents from my external hard drive. It is a 1TB drive divided into 3 parts.
Currently I can read and write to only the FAT partition. Hey, thank you so far for your tutorial. I accidentely formated my HFS external hard drive with exfat4. Might one of those be my partition? I accidentally erased my external HD with disk utilty. Should I run the deep search?
Thanks a lot for your reply. Using a data recovery software I recovered everything but without file names. But I have 2TB of files, which is a nightmare to reorder. Do you think something could be done with those partitions to recover the folder structure? Thanks and regards. Anyway, I got into pdisk and made it to the next steps: Command? Internet Explorer For Os X I explain my situation to you: my hd has three equal partitions.
I have more partitions but the troubled partition keeps unmounted. What am I doing wrong? I appreciate any help. Does anyone know why the message the map is not big enough remains even after trying all sector sizes? It looks it should be for a 2TB external but tried other sizes as well. I could see from Data Rescue the full structure is there however it does not mount. Please any help would be appreciated. Is there good chances to recover at least the movie files in one piece?
Hey, Thx for all this help. I can also access data but only via diskdrill pro. Disk utilities sees a blank partition on each drive. But in pdisk it is still recognized as , so I have the same mapping size error. What did I miss? Most of the times this issue is due to disk manufacturers using different block sizes to increase storage capacity in their devices.
Usually the way to figure out the right block size is taking the number of blocks from testdisk and doing some math around number of blocks and expected device size to figure out the right block size. To repair the startup volume, run First Aid from Recovery. Here under the details:DiskUtility. Checking extents overflow file. Checking catalog file. Checking multi-linked files. Checking catalog hierarchy. Checking extended attributes file. Checking volume bitmap. Checking volume information. File system check exit code is 0. Checking Core Storage Physical Volume partitions Problems were found with the partition map which might prevent booting Operation successful.
My partition is gone, no volume, nothing… Do you have any idea how I can get back my data? Updating boot support partitions for the volume as required. Reviewing boot support loaders Checking Core Storage Physical Volume partitions Repairing storage system Checking volumedisk1s2: Scan for Volume Headers Invalid Volume Header 0: incorrect block type Invalid Volume Header unsupported format disk1s2 did not complete formatting as a CoreStorage volume Storage system check exit code is 1.
Problems were encountered during repair of the partition map Error: This disk needs to be repaired. Click Repair Disk. Thanks a lot for your help!!!!! So this has actually happened to me twice in the last two months, on two different drives and I feel like I have gone over and over and tried everything in this thread and still no luck.
Like, what amount do we need to pay to get the creator to update the program and get that working? Of course, with the link reference to you. Thanks so Much Perrohunter. It even mounted the hidden Recovery Drive partition. I need so me advice though. I go ahead any way and proceed to write the map, I get the following: pdisk: Unable to write block zero Invalid argument pdisk: Unable to write block 1 Invalid argument pdisk: Unable to write block 2 Invalid argument both drives have logical sectors.
I have seen several people asking the same question as I do, but could not find solution. The TestDisk runs quick search very slow. I presume it will run for several days with its current speed. Could you please tell me if there is a way to make quick search quicker? I had backed up my problematic drive beforehand using Disk Drill but this procedure is a great help. A Huge Thanks to you, Richard. Yes, recovering the partition table with this procedure should rever the damage, but just to be sure do keep recovering all the data you can before attempting this as you are already doing.
The data is almost finished recovering, thanks. How do I know what to list for the sector sizes? Is that something that I need to figure out myself? Hi, short question. I can only access internet recovery. I did this because to check whether my ssd is functioning properly or not. I asked help from several forums they said to mount my ssd externally to a Linux through livecd and use gparted. Im slowly trying to understand the fact that my ssd is failing but my question is how can it detect or how can it initialize and write partitions through pdisk and I checked badblocks and no badblocks occurred in my process.
Also when using dd in terminal it stated some records are in and some records are out like that. Just checking in to say that this guide worked perfectly. I started in target mode with a thunderbolt cable to attach the drive to another mac, got the info I needed from testdisk, and as soon as I wrote the new partition table it was recognized. Thanks for recovering a RAID setup that appeared hosed! Hope you enjoy the beers! How can I trust your instructions after this highjacking attempt? It shows up in my disk utility but is grayed out and cannot be verified or repaired. I installed the os on an external drive and booted up from there.
Does this mean that all data on the drive will be destroyed? I never partitioned the drive but it was the drive i used to run my OS. Test disk was able to recover it! After analysing the disc, testdisk gave me the option to write back the partition, just selected it and voila! You sir are a Hero. Ages trawling the net and loads of useless recovery software — should have come straight here! I am sure my files are still in there because the drive stopped mounting out of the blue and I ever did a format to delete it. Data Rescue can see the tree correctly but cannot recover.
Is there a way to revive the original single partition and have access to those folders and files? Many thanks. I just checked out your website perrohunter. With THIS SOFTWARE the link submission process will be the easiest task and completely automated, you will be able to build unlimited number of links and increase traffic to your websites which will lead to a higher number of customers and much more sales for you. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. The next steps are what distinguish a child from a Men 8.
Thanks to Stan Alien for the heads up.