The VMS freeware program RZDISK allows changing the codepage and
reformatting.  The only time this program did not work for me was with an
IBM 0661 disk.  Then I was able to get them from 524 to 512 bytes/sector
with a RS/6000 using diag>disk media utilities>format media.

On 27 Mar 2000, Eric Smith wrote:

> > > I think the disk drives are going to be using 520 byte sectors, instead of
> > > 512-byte, or something else sane.  I know solaris can handle them, as I
> > > have one IBM scsi drive I ripped out of an old AS/400.  It runs
> > > flawlessly, except for that it likes to get hot..
> > 
> > I tried formatting them on my VS3100 breadboard using test 75.  Alas,
> > they did not take to formatting.  There must be some minor IBMisms
> 
> If they're set to the wrong sector size, just doing a format isn't enough.
> You need to write to a mode page to change the sector size first, then
> do a format.  Many (most?) platforms and software are not set up to do
> that.
>