Any tool that repairs a corrupted VDI file?

[leonbnu]

Host: vista
Guest: debian 64bit

The guest suddenly crashed when i was switching branches in git. Then I couldn't start the VM again. After I removed the img . I couldn't attach it again to the SATA controller, It gives me error saying "VERR_NOT_SUPPORTED". Then i also tried the CloneVDI tool, it tells me not recognized VDI file format. So I guess the img file is corrupted somehow ?

Then I opened the VDI file with a binary reader, I can still see my project files. So I am wondering there is anything that I can try to repair this VDI file ?
Here is the first part of the VDI file

Code: Select all

Offset(h)  00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

000000000  D9 04 76 8E B3 EB 22 8A 18 F1 B5 5D 3C 8C 0C E1  Ù.vŽ³ë"Š.ñµ]<Œ.á
000000010  36 C1 62 CF F9 76 AE 3D 13 90 A5 28 02 DB 46 BC  6ÁbÏùv®=..¥(.ÛF¼
000000020  05 76 92 78 9B 62 64 69 97 B0 17 5E 88 D4 C3 3E  .v’x›bdi—°.^ˆÔÃ>
000000030  B0 96 3A EF 3F CA 9C C1 91 01 52 83 49 6B D6 C0  °–:ï?ÊœÁ‘.RƒIkÖÀ
000000040  DC 44 4F BB 1B FB 0E 4D 90 01 00 00 01 00 00 00  ÜDO».û.M........
000000050  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000060  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000070  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000080  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000090  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000000A0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000000B0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000000C0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000000D0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000000E0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000000F0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000100  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000110  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000120  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000130  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000140  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000150  00 00 00 00 00 10 00 00 00 10 04 00 00 00 00 00  ................
000000160  00 00 00 00 00 00 00 00 00 02 00 00 00 00 00 00  ................
000000170  00 00 00 00 10 00 00 00 00 00 10 00 00 00 00 00  ................
000000180  00 00 01 00 D9 91 00 00 C3 2F D5 79 EE 70 B8 45  ....Ù‘..Ã/Õyîp¸E
000000190  AB C9 5E 91 D6 0F 06 6F 84 B5 19 1A 27 D4 E2 45  «É^‘Ö..o„µ..'ÔâE
0000001A0  B7 EF 43 96 85 FF 93 AF 00 00 00 00 00 00 00 00  ·ïC–…ÿ“¯........
0000001B0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000001C0  00 00 00 00 00 00 00 00 00 04 00 00 FF 00 00 00  ............ÿ...
0000001D0  3F 00 00 00 00 02 00 00 B4 27 2F F9 ED 79 FA 17  ?.......´'/ùíyú.
0000001E0  EC 2D BC 14 0D 2C 45 8A 5E E7 98 7E E6 62 16 7D  ì-¼..,EŠ^ç˜~æb.}
0000001F0  80 88 03 04 BF 08 9A 6A 5B 49 CF D6 65 79 4E C7  €ˆ..¿.šj[IÏÖeyNÇ
000000200  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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000000690  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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000000800  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000810  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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000000860  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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0000008E0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000008F0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000900  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000910  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000920  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000930  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000940  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000950  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000960  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000970  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000980  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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0000009A0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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0000009C0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000009D0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000009E0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
0000009F0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A00  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A10  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A20  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A30  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A40  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A50  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A60  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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000000A80  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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000000C60  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
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[mpack]

FIRST MAKE A BACKUP OF THE VDI FILE IN CASE YOU MAKE THINGS WORSE.

Your VDI file is definitely corrupted, but it looks to me like it's only the preheader which is damaged. The preheader is like a signature that marks this as a legit VDI file, but it doesn't contain any data. The UINT cbSize field at offset 72 (48 hex) is the first field of the true header, and this contains the four byte value I would expect (90 01 00 00), and I think the fields after that are ok too.

If this the only corruption then it should be easy to fix. The hex editor you mentioned hopefully allows you to copy and paste between files, so just replace the first 72 bytes of the damaged file with that from an undamaged VDI. That should repair the damage.

[leonbnu]

Thank you so much! backing up my VDI image now, going to replace the first 72 bytes, fingers crossed..

[leonbnu]

Yes, it worked!
Thank you so much for your help!

[vbox4me2]

Make sure you run a chkdsk now.

[Giorgio]

Hy,
I have a big problem, my VM will not open, this is the error when I open the virtual machine.
Thanks

Could not open the medium '/Volumes/admin/Desktop/MACWIN2003/MACWIN2003.vdi'.
VDI: invalid pre-header in '/Volumes/admin/Desktop/MACWIN2003/MACWIN2003.vdi' (VERR_VD_VDI_INVALID_HEADER).
VD: error VERR_VD_VDI_INVALID_HEADER opening image file '/Volumes/admin/Desktop/MACWIN2003/MACWIN2003.vdi' (VERR_VD_VDI_INVALID_HEADER).


Codice 'uscita:
NS_ERROR_FAILURE (0x80004005)
Componente:
Medium
Interfaccia:
IMedium {05f2bbb6-a3a6-4fb9-9b49-6d0dda7142ac}

[mpack]

Sorry, my crystal ball is broken. If you want me to comment on your VDI corruption then you need to give me the data. Note the information provided by the OP in this thread.

Incidentally, I would want to see the original data, not the stuff that you have been messing with. "I tried adding 72 bytes" does not sound good, and the other stuff you tried - I don't recognize at all.

[mpack]

It's a good job I revisited this thread by accident. It isn't a good idea to provide missing information by editing your previous post, because I don't get any notification that you've done that. As far the forum summary was concerned, I was the last person to comment in this thread.

More bad news: I've looked at the file snippet you provided and it's junk. This is not the header of a VDI file. It's some other kind of data entirely: the data is very dense - hardly a zero byte in sight, so I'd say it's a piece of executable code or it's compressed something (part of a zip maybe).

Now, you only gave me the first 4K of the file, which corresponds to a single file cluster. If you like you can zip up (say) the first 100k, and I'll take another look to see if anything is left.

Oh: and I suggest running a chkdsk on your host drive.

[Giorgio]

Hy Mpack, thanks for your help!

I attach the file

Sorry for my english...

[mpack]

The snippet posted is 9.7K, not the 100K asked for.

However, it's large enough that I should be seeing the start of the block map, and I'm not - it's still garbage all the way through to the end. I see no possibility of recovery, in fact I don't even believe this was ever a VDI file.

[Giorgio]

This is a file VDI, believe me
This is the result after the computer crashed. When I restarted the computer, the folder was not there! I found the file with a scan.
It was a Virtual Machine Hard Disk 500 GB, 70 GB used.

[mpack]

I found the file with a scan.

Then I'm afraid your scan tool has recovered the correct filename but the wrong data. The data does not come from a VDI file.

A crash (other than a head crash on the disk itself) will not lose data from a file. It specifically won't lose a file header! It isn't as if these things are held in volatile memory.

[Giorgio]

Ok Mpack! Thanks for you help!

[jpopelka]

Hello experts,

well I have a vdi file named winxp.vdi. I have just defragmented it and it worked fine. After shutdown of computer and restart I am not able to run it under Virtualbox, I see just a blackscreen with no activities on this virtual drive. Another VD named winXp.vdi that is on a second HD works flawlessly.
Any recommended remedy for such a behaviour?

[mpack]

@jpopelka, please start a new thread and describe your problem properly.

This thread does not match your question: if VirtualBox gives you an error that it can't open the VDI file, then you have a corrupted VDI file. If the VM starts but you have a problem with the guest... then you have a problem with the guest, not with the VDI, and therefore you don't have the problem being discussed in this thread.