Re: MO-Drive under 2.4.7 usinf vfat

From: OGAWA Hirofumi (
Date: Sun Jul 22 2001 - 09:07:29 EST


Detlev Offenbach <> writes:

> Hi all,
> I have just tested the new 2.4.7 kernel to see, whether it now works with a
> MO-Drive using the vfat filesystem. Unfortunately it still doesn't. Mounting
> a disk and writing to it is ok. However, when I try to read a file off the
> disk, the program crashes with a Segmentation fault and I get a oops in the
> messages file (see attachment). I tried ksymoops on this file, but either I
> did something wrong or it couldn't analyse it.

Is the capacity of your MO disk more than 640M?
In order to clarify a problem, please send the debugging output of FAT.

---------------------- start example --------------------------------
 $ mount -t vfat /dev/sda /mnt -o debug
 $ dmesg | tail
  Type: Optical Device ANSI SCSI revision: 02
Attached scsi removable disk sda at scsi0, channel 0, id 5, lun 0
sym53c875-0-<5,*>: asynchronous.
SCSI device sda: 310352 2048-byte hdwr sectors (636 MB)
sda: Write Protect is off
MSDOS: Hardware sector size is 2048
[MS-DOS FS Rel. 12,FAT 16,check=n,conv=b,uid=0,gid=0,umask=022]
Transaction block size = 2048
---------------------- end example --------------------------------

Perhaps, your MO disk will have the `ls' of a value smaller than 2048.
Logical sector size smaller than device sector size cannot be handled
with FAT of 2.4 series.


OGAWA Hirofumi <>

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