Hiya~ My wife's computer has a malfunction that I cannot fix. A first for me, I must admit. We woke up two days ago, and it had shut down during the night. I turned it on, and recieved an unmountable_boot_volume error with the primary error code as given in the thread title. I tried to get to the recovery console from the WinXP disk, but recieved the same error. So I started running Hiren's BootCD 8.6. A 16-pass memtest86, HDD Regenerator, Spinrite 6.0, Maxtor's built-in tools, PC Doctor, and Partition Magic were all used. The HDD works in all of the above programs, and came up with no physical or logical errors. I fdisked and zero'd the drive, then made a new NTFS partition. Should be fine after such extreme measures, right? Wrong. The WinXP disk still gives the same error. Ubuntu and Fedora Core both install with no issues, but my wife is not a Linux user. Not a lot of help. So... any ideas? I am using an 80-pin cable, UDMA settings are correct, mbrfix and chkdisk found no issues... I'm stumped.