[ubuntu] HD disk error

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http://ubuntuforums.org – Hi, I have 5 disks on my system, one old 320GB PATA drive with Ubuntu installed and 4x 2TB disks set up as RAID+LVM. Something is dieing and I'm not sure which it is. I'm getting these errors in dmesg Code: [99780.832028] ata4: lost interrupt (Status 0x50) [99780.832048] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen [99780.832055] ata4.00: failed command: READ DMA EXT [99780.832063] ata4.00: cmd 25/00:00:00:32:11/00:02:de:00:00/e0 tag 0 dma 262144 in [99780.832065]          res 40/00:00:00:4f:c2/00:00:00:00:00/40 Emask 0x4 (timeout) (Hardware)