can't mount 300G USB drive that's FAT32

[Matt Emmerton]

----- Original Message ----- 
From: "Dan Finn" <dhrider at gmail.com>
To: <freebsd-questions at freebsd.org>
Sent: Friday, June 25, 2004 4:31 PM
Subject: can't mount 300G USB drive that's FAT32


> the system sees the disk:
> Jun 24 15:37:30 stewie kernel: umass0: Maxtor OneTouch, rev 2.00/2.00,
addr 2
> Jun 24 15:37:30 stewie kernel: umass0: Get Max Lun not supported (STALLED)
> Jun 24 15:37:31 stewie kernel: GEOM: create disk da0 dp=0xc2d85050
> Jun 24 15:37:31 stewie kernel: da0 at umass-sim0 bus 0 target 0 lun 0
> Jun 24 15:37:31 stewie kernel: da0: <Maxtor OneTouch 0201> Fixed
> Direct Access SCSI-0 device
> Jun 24 15:37:31 stewie kernel: da0: 1.000MB/s transfers
> Jun 24 15:37:31 stewie kernel: da0: 286103MB (585938944 512 byte
> sectors: 255H 63S/T 36473C)
>
> this is a Maxtor 300G USB drive.  A backup was written to it via a
> linux 2.4 server and now I would like to mount it on my FBSD laptop to
> read it and work with the files.
>
> When trying to mount it using mount_msdos I get the following:
> [ root @ stewie : ~] : mount_msdosfs -o rw /dev/da0s1 /mnt/usb1/
> mount_msdosfs: /dev/da0s1: Invalid argument
>
> and in /var/log/messages I get the following:
> Jun 24 15:43:52 stewie kernel: mountmsdosfs(): disk too big, sorry
>
> when trying to use ntfs to mount it I get :
> [ root @ stewie : ~] : mount_ntfs /dev/da0s1 /mnt/usb1/
> mount_ntfs: /dev/da0s1: Invalid argument
> and nothing in any log file.
>
> One of the taks I need to accomplish here is to copy all of the data
> on this 300G USB drive onto an identical 300G USB drive.  I was going
> to mount both and just copy from one to the other.  After reading
> about the limited writing capabilities in the man page of mount_ntfs
> I'm wondering if I would be better off doing this on a linux box.  The
> linux box that created the origional backup onto the USB drive had no
> problem creating the Fat32 filesystem and writing to it.

FAT32 = msdosfs.  This is totally different than NTFS, so put all ideas of
using mount_ntfs out of your mind since it won't help.

The FAT32 support in FreeBSD currently doesn't support "large" disks.
I don't know the specific value of "large", but there is some comments in
the code that point at certain calculations that break for "large" disks.

--
Matt Emmerton