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I'm trying to create a VirtualBox image of Windows 8 Consumer Preview. I did exactly what was said in this tutorial, but at the step "Now navigate to the Windows 8 developer build ISO file that you downloaded and select it" I get the following error:

Could not get the storage format. (VERR_NOT_SUPPORTED)

I also get this if I use the regular wizard. I'm using VirtualBox version 4.1.16 on Windows 7. It happens with both 64-bit and 32-bit Windows 8 as the guest OS.

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Have you verified that the ISO image file containing the install for Windows 8 Consumer Preview has no errors?

You can find the different ISO image files and their corresponding SHA-1 hash checksums listed on this page: Windows 8 Consumer Preview ISO images

Microsoft provides an unsupported command line utility whose description says it would allow you to check the Sha-1 hash for your ISO. You could also find other checksum tools by searching for them with Google.

Thought I would just relate what happened when I tried using my suggestion above. The Sha-1 hash listed on the Windows 8 Consumer Preview ISO images page is

64-bit (x64)  Sha 1 hash — 1288519C5035BCAC83CBFA23A33038CCF5522749 
32-bit (x86)  Sha 1 hash — E91ED665B01A46F4344C36D9D88C8BF78E9A1B39     
Product Key:   DNJXJ-7XBW8-2378T-X22TX-BKG7J

The results I got from using the fciv utility on the ISO images I downloaded today from that site are

1288519c5035bcac83cbfa23a33038ccf5522749 Windows8-ConsumerPreview-64bit-English.iso
e91ed665b01a46f4344c36d9d88c8bf78e9a1b39 Windows8-ConsumerPreview-32bit-English.iso

The Sha-1 hash for Windows 8 Consumer Preview (64-bit) which I downloaded a month ago (~ April 30), are below. I found it interesting that the hash does not match. In other words, Microsoft has apparently (silently?) changed the install ISO for Windows 8. I wonder what was changed? (And why?)

737b33046dc5c9d4f3cf9a6f001ebf2d059afb21 Windows8-ConsumerPreview-64bit-English.old.iso
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I redownloaded twice, and all 3 didn't give the correct SHA-1 hash. Thanks for the help. – Bart Burg May 30 '12 at 7:11
@BartBurg Answer updated. (Nothing particularly useful. Just anecdotal observations FWIW.) – irrational John May 31 '12 at 5:25

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