increasing dd disk to disk transfer rate

[Stefan Bethke]

Am 13.01.2006 um 14:29 schrieb Christoph P. Kukulies:

> Just for the record: Before I wanted to give back in my faulty disk
> to my computer supplier as a case for warranty, I zeroed out the  
> faulty
> disk.
>
> dd if=/dev/zero of=/dev/ad2 bs=1m
>
> It took half an hour to zero out the 80GB. Transferrate 44 MB/s?
> And not a single error ? Or is this normal?

Depending on the model, 44 MB/s seems quite OK. Certainly on the fast  
side for a 2.5" laptop drive, but not unheard of these days.

It is quite possible that the disk controller had a couple of sectors  
it could not read anymore (and giving I/O errors for them), but was  
able to reallocate once you wrote to them.  I would still ditch the  
disk, though.  Would be interesting to see what the smart reallocated  
sector count says.


Stefan

-- 
Stefan Bethke <stb at lassitu.de>   Fon +49 170 346 0140