Large msdosfs disk will not mount on RELENG_6

[Rink Springer]

Hi Richard,

On Sun, Nov 26, 2006 at 10:23:14PM -0500, Richard Coleman wrote:
> I just bought a large external hard drive for home backups (500g Western 
> Digital My Book).  When I plug it in to my machine (RELENG_6 from about a 
> week ago), the system sees the device just fine:
> 
> Nov 26 22:03:21 neptune kernel: umass0: Western Digital External HDD, rev 
> 2.00/1.06, addr 2
> Nov 26 22:03:21 neptune kernel: uhid1: Western Digital External HDD, rev 
> 2.00/1.06, addr 2, iclass 8/6
> Nov 26 22:03:21 neptune kernel: da0 at umass-sim0 bus 0 target 0 lun 0
> Nov 26 22:03:21 neptune kernel: da0: <WD 5000YS External 106a> Fixed Direct 
> Access SCSI-4 device
> Nov 26 22:03:21 neptune kernel: da0: 40.000MB/s transfers
> Nov 26 22:03:21 neptune kernel: da0: 476940MB (976773168 512 byte sectors: 
> 255H 63S/T 60801C)
> 
> 
> But when I try to mount the drive (mount -t msdos /dev/da0 /mnt), the 
> system gives the following error:
> 
> Nov 26 22:06:41 neptune kernel: mountmsdosfs(): disk too big, sorry
> 
> I was surprised to see a file system limitation on FreeBSD that Windows 
> does not have.  I will probably reformat the system to ufs2, but thought I 
> would mention this error message.  I'm sure these drives will become 
> increasingly common.

Looking at /sys/fs/msdosfs/msdosfs_vfsops.c seems to hint the existance
of options MSDOSFS_LARGE; this avoids the error message and will let you
mount the disk.

Perhaps it's time for an update of msdosfs(5) ? (I've CC-ed Tom Rhodes
for this).

Regards,

-- 
Rink P.W. Springer                                - http://rink.nu
"It's you isn't it? THE BASTARD OPERATOR FROM HELL!"
"In the flesh, on the phone and in your account..."       - BOFH #3
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