On Mon, Jun 03, 2013 at 03:34:07AM +0100, MD wrote:
> On 01/06/13 15:59, MD wrote:
> >On 01/06/13 12:56, Kenneth R Westerback wrote:
> >>On Sat, Jun 01, 2013 at 07:38:50AM +0100, MD wrote:
> >>>Recently obtained WD7500-BPKT (750g) hard drive that apparently
> ><snip>
> >>>Will Advanced Format Just Work(TM)?
> <snip>
> >>If the drive claims to be using 512-byte sectors, everything should
> >>work but potentially be slow due to the drive compensating for
> >>i/o into the middle of 4K sectors.
> <snip>
> >>.... Ken
> >>
> >>
> >
> >Thanks for the quick response Ken.
> >
> >dmesg indicates the drive reports 512 byte sectors - bah humbug.
> >
> >disklabel pushed start to sector 64, though.
> >
> >Looks like I need to go back in and try to manually create the 4k
> >sectors by careful management of partition boundaries through
> >disklabel (I was going to DBAN it, anyway).
>
>
>
> Dear He-who-shall-remain-nameless (You know who you are...) ;-))))
> and List-friends,
>
> A mere slip of phraseology in my response to Sir Ken... :-))
>
>
> Advanced Format drives HAVE 4k sectors on the platters, init.
> The WD7500-BPKT is an Advanced Format drive.
>
> But your criticism (He-who-etc.-etc.) has been helpful - if only
> to bump me back to reality.
>
> My take away is:
>
> On installation, fdisk partitioned the drive by default with the
> OpenBSD partition starting at...
>
> Physical/LBA (512-byte) sector 64
>
> (oh yes... nudge-nudge wink-wink)...
>
> and subsequent OpenBSD partitions (i.e. logical partitions)
> starting on exact multiples of 4096bytes...
>
> JUST BY ACCIDENT!!!
No, that isn't an accident. We moved the default fdisk start 1 sector some
time ago and changed a few thing in disklabel to make this happpen.
-Otto
>
> Thanks for all the help, chaps.
>
> Mike
>
> P.S. The fact my block size in /home is 64k is my fault...
