Re: HFS-formatted CDROMs (was: Re: Linux 2.4 Status)

From: Theodore Ts'o (tytso@mit.edu)
Date: Thu Aug 10 2000 - 11:36:36 EST


   Date: Thu, 10 Aug 2000 15:13:28 +0200
   From: Jens Axboe <axboe@suse.de>

> Uh, normally I wouldn't comment, but I believe you have this exactly
> backwards. Last I checked you can't boot a Sun from a drive that's _not_
> set to 512-byte sector mode, and I've never seen a non-SCSI CD-ROM drive
> that had the option.
>
> CD-ROM "normal data" sectors are 2048 bytes, not 512.

   Yes, it is backwards. You wont find many IDE drives that support 512 byte
   sectors, and not even all SCSI drives do.

   The bugs is in the SCSI CD-ROM driver, it doesn't properly handle
   requests smaller than 2048 per block. So yes it is a known bug.

OK, can we get confirmation from folks that the problem with HFS
filesystems only occurs on with folks who are using SCSI CD-ROM's?

I just want to make sure this is properly noted on the 2.4 issues
page.....

                                                - Ted

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