Buffer I/O error while booting from BackTrack 4.0 live CD using VirtualBox

Question

I am facing a problem while installing BackTrack 4.0 on my VirtualBox installation. After assigning a hard drive and booting from the live CD, I am receiving a error message as follows.

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Buffer I/O error on device hdc, logical block 76636
(this statement gets repeated like four times with different logical block id. 
SQUASHFS error: squashfs_read_data failed to read block 0x5bb337b9
SQUASHFS error: unable to read is index table.

It is not the first time I install operating systems on VirtualBox though it is the first time I receive such an error with BackTrack.

Answer 1

It may be due to a corrupted image. Compute the MD5 hash value of the download (with md5sum) and compare with the supplied MD5 hash value.