Can't see my sata disk suddenly.

I used to have it mounted on /home over my xfs disk(which also had a /home, but that shouldn't matter right!?). The sata disk was/is a ext3 disk. And i'm sorry but this is all i can tell:
1. i got a ext3 error spitted out on console.
2. i think, a sudo fuser -km /dev/sdb
3. sudo umount /dev/sdb
Then i reebooted and suddenly /dev/sdb doesn't exist in /dev...
edit: found a log for my ext3 errors: http://pastebin.archlinux.org/1236
Id the disk is the culprit, which tests should i run on it to see what's wrong with it. I suppose i could run some tests with some programs even though i can't even see it in /dev.
I'm running -fallback standard arch kernel, since that's the only one i got working. (For history and perhaps more clues pertaining to this problem see http://bbs.archlinux.org/viewtopic.php?id=29132)

root|/home/kris$ mkfs.ext3 -L nydisk /dev/sdb
mke2fs 1.39 (29-May-2006)
/dev/sdb is entire device, not just one partition!
Proceed anyway? (y,n) y
Warning: could not erase sector 2: Attempt to write block from filesystem resulted in short write
Filesystem label=nydisk
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
9076736 inodes, 18153264 blocks
907663 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=20971520
554 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Warning: could not read block 0: Attempt to read block from filesystem resulted in short read
Warning: could not erase sector 0: Attempt to write block from filesystem resulted in short write
Writing inode tables: done
ext2fs_mkdir: Attempt to read block from filesystem resulted in short read while creating root dir
and
14:26:08 ~ $ sudo mount -t ext3 /dev/sdb /mnt/sdb/
mount: wrong fs type, bad option, bad superblock on /dev/sdb,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
14:28:19 ~ $ dmesg|tail
Buffer I/O error on device sdb, logical block 0
Buffer I/O error on device sdb, logical block 1
Buffer I/O error on device sdb, logical block 2
Buffer I/O error on device sdb, logical block 3
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 2
EXT3-fs: unable to read superblock
and
14:29:49 ~ $ dmesg|tail -20
end_request: I/O error, dev sdb, sector 144965648
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 144966672
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 144967696
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 144968720
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 0
printk: 283660 messages suppressed.
Buffer I/O error on device sdb, logical block 0
Buffer I/O error on device sdb, logical block 1
Buffer I/O error on device sdb, logical block 2
Buffer I/O error on device sdb, logical block 3
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 0
Buffer I/O error on device sdb, logical block 0
sd 3:0:0:0: SCSI error: return code = 0x00040000
end_request: I/O error, dev sdb, sector 2
EXT3-fs: unable to read superblock

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