badblock can not be detected

[gdstm-lnxmlsts@yahoo.com]

Hi,

I have an hard drive that connects to my laptop through the USB 2.0 interface.it was bought at 2006. some months before, it started to report error on read. I reformatted it use the

mkfs.ext3 -c /dev/sda1

But it didn't detected any badblock.
then I copied some files to it, then read out, it shown the error:

usb 5-4.3: reset high speed USB device using ehci_hcd and address 5
sd 0:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
end_request: I/O error, dev sda, sector 214814735
usb 5-4.3: reset high speed USB device using ehci_hcd and address 5

I think that's because there are some badblocks on the disk, so I ran 

fsck.ext3 -c /dev/sda1

but this time it still didn't find out any badblock.

any idea about it? thanks.


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