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SubjectRE: Magneto Optical ATAPI (IDE) disk, Fujitsu, 2048 Bytes/sector
Date
> Alan,
>
I wrote the other day asking about 640 MByte MO
disks. Sorry to keep on about it, but it still doesn't work
> for me. I have now built a 2.2.x (x=6) kernel (no, I don't have a more
> recent one, but will get it if the required change has occurred in the
> last 6 versions - which I doubt).
>
> Remember, it's an IDE(ATAPI) MO, not SCSI. Now, inside the ide-floppy
> module, there's a check for device type 7, after which it happily goes and
> prints out that it's seen an "OPTICAL" disk device. Great! But, a few
> lines
> later (this is in the identify procedure, if I remember correctly - I'm
> not
> writing this from my Linux machine), the code goes and says that " if the
> device type is not 0 (zero) then return FALSE" , with an error saying that
> it doesn't support this kind of device. That's about as much use as a
> bicycle
> is to a fish.
>
> So I hacked that piece of code to make it think that both types 0 and 7
> are acceptable IDE floppies. And now I'm back to the "2048 bytes/sector
> not supported" problem - even in the 2.2.x kernel. The first request sent
> to the device is only 1024 bytes long, and it fails.
>
> Is there a patch to make these gadgets work? Is there an "ide-mo.c"
> module
> that can be included, where the blocksize is correctly set up? Because
> "ide-floppy" sure as heck doesn't set it up. I even tried hacking
> blksize_size[major][minor]=2048 in the ide-floppy setup code. That also
> doesn't work.
>
> I am now at a loss to know how to make the ide drivers talk to Fujitsu's
> 640 MByte ATAPI MO disks.
>
> Alan Watson
> Corporate Technologies
> Johannesburg
> South Africa
>
> > they see my MO disk. Linux now (kinda) believes that it can drive this
> > little gadget
> > as an ide-floppy (type 7) ATAPI device. That's good. And it sees all
> the
> > specs about
> > the disk.
>
> Linux 2.2.x handles the disks fine, including the 2K block size. The
> partitioning setup is also handled by 2.2.x and modern fdisk binaries
>
> Alan
>
>
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