[plug] Alternating caps problem

[Arkem]

I woke up this morning to a very wierd and disturbing situation on my 
computer. In a few select directories (and their subdirectories) off 
my home directory all the file names have been mutilated, some have 
just been converted into alternating caps versions of their previous 
names others have had odd characters inserted into them and in some 
cases whole subdirectories have become empty. This occoured sometime 
between 8pm and 6:30am (At 6:27 or so a cron job ran and its output 
was the first to indicate something was wrong) and the only log 
entries that may be of relevance were this section from 
/var/log/messages: (appologies for the spam)

Oct 26 06:16:18 mornmist -- MARK --
Oct 26 06:28:40 mornmist kernel: hda: dma_intr: status=0x51 { 
DriveReady SeekComplete Error }
Oct 26 06:28:40 mornmist kernel: hda: dma_intr: error=0x84 { 
DriveStatusError BadCRC }
Oct 26 06:28:40 mornmist kernel: hda: dma_intr: status=0x51 { 
DriveReady SeekComplete Error }
Oct 26 06:28:40 mornmist kernel: hda: dma_intr: error=0x84 { 
DriveStatusError BadCRC }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: status=0x51 { 
DriveReady SeekComplete Error }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: error=0x84 { 
DriveStatusError BadCRC }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: status=0x51 { 
DriveReady SeekComplete Error }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: error=0x84 { 
DriveStatusError BadCRC }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: status=0x51 { 
DriveReady SeekComplete Error }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: error=0x84 { 
DriveStatusError BadCRC }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: status=0x51 { 
DriveReady SeekComplete Error }
Oct 26 06:28:41 mornmist kernel: hda: dma_intr: error=0x84 { 
DriveStatusError BadCRC }
Oct 26 06:28:41 mornmist kernel: hdb: DMA disabled
Oct 26 06:28:41 mornmist kernel: ide0: reset: success

hda1 is particion that this all happened on (its mounted as /home) 
does this log indicate that hda is failing? Or is this possibly the 
result of an intrusion? If its a simple intrusion does anyone know 
how I could easily reverse the alternating caps problem? (how would I 
for example write a shell script that mv's all files so they all have 
lower case names?)

oh BTW I'm running Debian Sid on kernel 2.4.10

Near a panic,
Arkem