Hey folks,

I am running 11.04 and go into the disk utility and select my USB
drive because I want to run a benchmark on it with the benchmarking
feature of the disk util.

At first it told me the disk had to have no partitions so I wiped them
and tried again.

Now it says it fails because "the disk seems to have usage raid -
write benchmarking requires the disk to be completely empty"

So I google that and check this list. In google I found the same
problem and they fixed it by using dd to wipe the MBR

dd if=/dev/zero of=/dev/sdb bs=512 count=1

So I tried that and still get the same error. Even if I write zeros
for a much longer time than just count=1

Any ideas?

thanks,
-Alan

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>At first it told me the disk had to have no partitions so I wiped them and
tried again.

Wiped them how? Gparted is a good way to delete or add partitions, etc.

Are you trying to run the read-only or the read/write benchmark test?




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On Thu, Nov 24, 2011 at 08:55:08AM -0500, Alan McKay wrote:
> I am running 11.04 and go into the disk utility and select my USB
> drive because I want to run a benchmark on it with the benchmarking
> feature of the disk util.
>
> At first it told me the disk had to have no partitions so I wiped them
> and tried again.
>
> Now it says it fails because "the disk seems to have usage raid -
> write benchmarking requires the disk to be completely empty"
>
> So I google that and check this list. In google I found the same
> problem and they fixed it by using dd to wipe the MBR
>
> dd if=/dev/zero of=/dev/sdb bs=512 count=1
>
> So I tried that and still get the same error. Even if I write zeros
> for a much longer time than just count=1

I think the RAID metadata lives somewhere near the end of the device, not at the
beginning.

Try mdadm --zero-superblock /dev/sdb

Marius Gedminas
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