I has a similar problem. This is what I find in the system log.
Jun 17 22:25:50 Tritonio kernel: [22870.792000] ata1.01: exception Emask 0x0 
SAct 0x0 SErr 0x0 action 0x2 frozen
Jun 17 22:25:50 Tritonio kernel: [22870.792000] ata1.01: cmd 
a0/00:00:00:00:20/00:00:00:00:00/b0 tag 0 cdb 0x1e data 0 
Jun 17 22:25:50 Tritonio kernel: [22870.792000]          res 
40/00:03:00:00:00/00:00:00:00:00/b0 Emask 0x4 (timeout)
Jun 17 22:25:57 Tritonio kernel: [22877.792000] ata1: port is slow to respond, 
please be patient (Status 0xd0)
Jun 17 22:26:20 Tritonio kernel: [22900.808000] ata1: port failed to respond 
(30 secs, Status 0xd0)
Jun 17 22:26:20 Tritonio kernel: [22900.808000] ata1: soft resetting port
Jun 17 22:26:21 Tritonio kernel: [22901.500000] ata1.00: ata_hpa_resize 1: 
sectors = 234441648, hpa_sectors = 234441648
Jun 17 22:26:21 Tritonio kernel: [22901.508000] ata1.00: ata_hpa_resize 1: 
sectors = 234441648, hpa_sectors = 234441648
Jun 17 22:26:21 Tritonio kernel: [22901.508000] ata1.00: configured for UDMA/100
Jun 17 22:26:21 Tritonio kernel: [22901.688000] ata1.01: configured for UDMA/33
Jun 17 22:26:21 Tritonio kernel: [22901.688000] ata1: EH complete
Jun 17 22:26:21 Tritonio kernel: [22901.696000] SCSI device sda: 234441648 
512-byte hdwr sectors (120034 MB)
Jun 17 22:26:21 Tritonio kernel: [22901.712000] sda: Write Protect is off
Jun 17 22:26:21 Tritonio kernel: [22901.712000] sda: Mode Sense: 00 3a 00 00
Jun 17 22:26:21 Tritonio kernel: [22901.736000] SCSI device sda: write cache: 
enabled, read cache: enabled, doesn't support DPO or FUA
Jun 17 22:26:21 Tritonio kernel: [22901.760000] SCSI device sda: 234441648 
512-byte hdwr sectors (120034 MB)
Jun 17 22:26:21 Tritonio kernel: [22901.776000] sda: Write Protect is off
Jun 17 22:26:21 Tritonio kernel: [22901.776000] sda: Mode Sense: 00 3a 00 00
Jun 17 22:26:21 Tritonio kernel: [22901.792000] SCSI device sda: write cache: 
enabled, read cache: enabled, doesn't support DPO or FUA

I get this error many times a day! It's really annoying because the
whole system locks up for 30 seconds. At lest Wanda the fish still suims
and Geyes follow the mouse pointer so I have something to play with. The
funny thing is that I had this problem with windows XP too since I
bought the laptop! But back then I wasn't even able to see what the
problem was... I will try to update the firmware soon and post the
results here or in one of the 6 duplicates. I have an Acer Aspire
9424WSMi with a TSSTcorp CD/DVDW TS-L632D.

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Hard disk I/O randomly freezes when hald is running and optical drive is empty
https://bugs.launchpad.net/bugs/84603
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