I've had troubles with my USB HD for some time:
I can read directories and files but I can't create direcotries or files anymore. I've tried several firmware version (official and customized) but was unable to determine the problem, exept that a 'ls' on the root directory on the HD showed a lot of garbage.

Now I've installed the latest firmware (1.7.5.6 customized by Oleg) and it contains a lot more debugging information in the systemlog. This is what is shows:

Jan 1 01:00:22 WL500g user.warn klogd: usb.c: USB device 2 (vend/prod 0x5e3/0x702) is not claimed by any active driver.
Jan 1 01:00:27 WL500g user.warn klogd: Vendor: SAMSUNG Model: SV1604N Rev: 0811
Jan 1 01:00:27 WL500g user.warn klogd: Type: Direct-Access ANSI SCSI revision: 02
Apr 5 00:20:22 WL500g user.warn klogd: Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
Apr 5 00:20:22 WL500g user.warn klogd: SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
Apr 5 00:20:28 WL500g user.warn klogd: Filesystem panic (dev 08:01).
Apr 5 00:20:28 WL500g user.warn klogd: FAT error
Apr 5 00:20:28 WL500g user.warn klogd: Directory 291: bad FAT
Apr 5 00:20:29 WL500g user.warn klogd: Filesystem panic (dev 08:01).
Apr 5 00:20:29 WL500g user.warn klogd: FAT error
[...]

Do more pleople have these errors or am I the only one? In case I'm the only one, I could try to format the HD again to check if this clears the errors...

PS. The datetime indication is a bit confusing, but I'm certain all the messages were created within a few second from each other.