CentOS - Sep 2020 - erasing a disk

On 2020-09-14 16:52, Robert Heller wrote:
> At Mon, 14 Sep 2020 13:14:44 -0700 CentOS mailing list
> <centos at centos.org> wrote:
> 
>> 
>> Folks
>> 
>> I've encountered situations where I want to reuse a hard-drive.  I
do
If it is a Seagate, don't bother.  They have the highest failure rate in 
the industry.

Look at the SMART statistics before deciding to re-use a disk, 
especially "Reallocated_Sector_Ct,"
"Power_On_Hours," and run the "extended SMART test."

Todd Merriman
Software Toolz, Inc.

At 02:36 PM 9/14/2020, you wrote:
>On 2020-09-14 16:52, Robert Heller wrote:
>>At Mon, 14 Sep 2020 13:14:44 -0700 CentOS mailing list
>><centos at centos.org> wrote:
>>
>>>Folks
>>>I've encountered situations where I want to reuse a hard-drive. 
I do
>
>If it is a Seagate, don't bother.  They have the highest failure 
>rate in the industry.
>
>Look at the SMART statistics before deciding to re-use a disk, 
>especially "Reallocated_Sector_Ct,"
>"Power_On_Hours," and run the "extended SMART test."
>
>Todd Merriman
>Software Toolz, Inc.
Todd

The reason I'm reusing a disk is not because of hardware failures, 
but rather because I've abandoned a particular use for that disk, 
maybe changed operating systems, maybe tried something using ZFS and 
want to change to some other techonology.  I know that the best way 
to reclaim a disk after read-failures is to wipe it with zeros, and 
this takes days.

And by the way, I typically use only WD disks, not seagate.

Thanks for the confirmation.

David

I've never run into a system yet where using dd to write zeros on the first
few megabytes didn't completely wipe the disk as far as the OS and existing
file systems are concerned..

dd if=/dev/zero of=/dev/sde bs=65536 count=1024