Subject: Re: support for or experience of Fujitsu DynaMO drives?
To: None <current@FreeBSD.ORG, current-users@NetBSD.ORG>
From: J Wunsch <firstname.lastname@example.org>
Date: 06/30/1997 06:57:10
As Andrew Reilly wrote:
> Can anyone comment on whether the Fujitsu DynaMO
> magneto-optical 640M drives work with FreeBSD or NetBSD?
FreeBSD even has an own driver handling the slightly different
requirements of removable media devices (od(4)). If this drive probes
as T_OPTICAL (type 7), it should be automatically assigned to the
The plain sd(4) driver should work as well, but things like ignoring
the first unit attention condition after a media change, or handling
the insertion of a medium with a different size might fail, or at
least cause annoying warnings.
> There seems to be several varieties of media available, but
> the types my local dealer has are the 230M and 640M. From a
> quick study of the Fujitsu web site, the 128M, 230M and 540M
> formats have 512-byte sectors, so I would not expect any
> problems with these.
I would expect the same.
> The 640M capacity disks have 2k-byte sectors, though. I
> know that most BSD filesystems make some pretty strong
> assumptions about the size of sectors, but wondered whether
> there were work-arounds in place.
The filesystems don't make many assumptions about the sector size, but
the filesystem implementations do. FreeBSD tries to handle some of
the issues of sector sizes > 512 bytes, but i know it's not yet at the
point where it should be. So it might work, but it might also fail.
> I guess I could put a TAR archive on one of these even if an
> FFS partition does not work?
Sure, you can always use the raw device, with the appropriate block
size. For a 2 KB medium, you should be able to create an ISO9660
filesystem and mount it without problems. :-)
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