problems with ata trigger hostbyte=DID_BAD_TARGET / ext3 mounted readonly

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• Host: Mac OS X 10.5.8
• Guest: Linux 2.6.28-11-generic #42-Ubuntu SMP (Mer 0.17? pre-something?)

I don't know when this started, i use Save machine state/Restore machine state instead of booting, and I can't run most things anymore:

timeless@timeless-tablet:~$ uptime
bash: /usr/bin/uptime: Input/output error
timeless@timeless-tablet:~$ touch ~
touch: setting times of `/home/timeless': Read-only file system
timeless@timeless-tablet:~$ mount|grep rootfs
rootfs on / type rootfs (rw)
timeless@timeless-tablet:~$ fsck /
fsck 1.41.4 (27-Jan-2009)
[142525.444929] end_request: I/O error, dev sda, sector 4442137
[142525.446041] end_request: I/O error, dev sda, sector 4442137
fsck.ext2: Input/output error

dmesg includes:

[117949.000986] ata1.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x6 frozen
[117949.003383] ata1.00: cmd 61/08:00:51:c5:77/00:00:00:00:00/40 tag 0 ncq 4096 out
[117949.003467]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[117949.004018] ata1.00: status: { DRDY }
[117949.005022] ata1.00: cmd 61/08:08:a9:05:20/00:00:00:00:00/40 tag 1 ncq 4096 out
[117949.005033]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[117949.006250] ata1.00: status: { DRDY }
[117949.018431] ata1: hard resetting link
...
[117998.034920] sd 0:0:0:0: [sda] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[117998.034926] end_request: I/O error, dev sda, sector 3726569
[117998.036349] Aborting journal on device sda1.
[117998.037541] sd 0:0:0:0: [sda] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
[117998.037546] end_request: I/O error, dev sda, sector 3674129
[117998.038852] Buffer I/O error on device sda1, logical block 459266
[117998.040267] lost page write due to I/O error on sda1
[117998.040295] JBD: Detected IO errors while flushing file data on sda1
[117998.236539] ext3_abort called.
[117998.238241] EXT3-fs error (device sda1): ext3_journal_start_sb: Detected aborted journal
[117998.241917] Remounting filesystem read-only

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dmesg output

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virtualbox log