On Tue, 28 Jun 2016, STeve Andre' wrote:
I am testing some new 8TB disks. I've taken to doing
dd if=/dev/zero of=/dev/rsd3c bs=64k
and
dd if=/dev/rsd3c of=/dev/null bs=64k
as a first test. It's depressing how often I've found problems
on big disks. Today, the read test produced an error in the messages
file I've not seen before:
Jun 28 16:17:39 paladin /bsd: sd3(umass0:1:0): Check Condition (error 0x70)
on opcode 0x28
Jun 28 16:17:39 paladin /bsd: SENSE KEY: Aborted Command
Jun 28 16:17:39 paladin /bsd: ASC/ASCQ: Information Unit iuCRC Error
Detected
So it isn't a soft read error -- what is it? It might be useful to
indicate where the error occurred? This is the second of three
disks to be tested. It's connected to a Thermaltake USB 3.0
disk enclosure.
I have seen CRC errors number of times when working with different USB
enclosures. My guess is that either the connectors inside the boxes aren't
100% tight, the electronics is not shielded properly or it has some flaws.
If I am not mistaken, it is the transfer between the HDD electronics and
the controller (ie. the bridge chip) that failed.
Also see this thread:
http://marc.info/?t=109898077600008&r=1&w=2
I would also monitor the drive with smartctl from sysutils/smartmontools.
Regards,
David
