Re: Formatting second partition on USB flash disk
On Fri, 11 Mar 2005 13:51:04 +0100, Andreas Rippl <a.rippl@gmx.net> wrote:
> On Fri, Mar 11, 2005 at 01:18:13PM +0300, Alphonse Ogulla wrote:
> > Hi list,
> > I created 2 partitions of 256mb each in a 512mb USB flash disk using
> > cfdisk and formartted them as Win95 FAT32 (LBA) and Linux ext2 as
> > shown below. Whereas I'm able to mount the first partition without any
> > problem, mount command fails when trying to mount the second partition
> > with the "wrong fs type..." error.
> >
> > atlas:~# cfdisk /dev/sda
> >
> > atlas:~# mkfs.vfat -v /dev/sda1
> > mkfs.vfat 2.8 (28 Feb 2001)
> > /dev/sda1 has 255 heads and 63 sectors per track,
> > logical sector size is 512,
> > using 0xf8 media descriptor, with 530082 sectors;
> > file system has 2 16-bit FATs and 16 sectors per cluster.
> > FAT size is 130 sectors, and provides 33111 clusters.
> > Root directory contains 512 slots.
> > Volume ID is 42316a7f, no volume label.
> >
> > atlas:~# mkfs.ext2 -v /dev/sda2
> > mke2fs 1.34 (25-Jul-2003)
> > Filesystem label=
> > OS type: Linux
> > Block size=1024 (log=0)
> > 64512 inodes, 257040 blocks
> > 12852 blocks (5.00%) reserved for the super user
> > First data block=1
> > 32 block groups
> > 8192 blocks per group, 8192 fragments per group
> > 2016 inodes per group
> > Superblock backups stored on blocks:
> > 8193, 24577, 40961, 57345, 73729, 204801, 221185
> Not directly related to your question, just a hint:
> If this is not going to be a system partition, just data, I tend to use
> the '-m 0' option to mkfs.ext2. As you can see, '12852 blocks (5.00%)
> reserved for the super user'. That makes a gain of ~12.5Mb of extra
> space. This reserved space is there in case the filesystem is full,
> for root to be able to fix things. In fact, I do the same for my /home
> partition, as 5% of 40Gb....2Gb!!
> >
> > Writing inode tables: done
> > Writing superblocks and filesystems accounting information: done
> >
> > This filesystem will be automatically checked every 28 mounts or
> > 180 days, whichever comes first. Use tune2fs -c or -i to override.
> >
> >
> > atlas:~# mount -t vfat -o rw /dev/sda1 /mnt/usb1
> >
> > atlas:~# mount -t ext2 -o rw /dev/sda2 /mnt/usb2
> > VFS: Can't find ext2 filesystem on dev sd(8,2).
> > mount: wrong fs type, bad option, bad superblock on /dev/sda2,
> > or too many mounted file systems
> >
> > Now the question;
> > What do I need to do in order to use the second partition in my USB
> > flash disk? Then you may ask - why do I need to do this? So that
> > whenever I lend out my flash disk to colleagues using windoze, they
> > wont get to see my stuff on the Linux ext2 partition.
> >
> > Thanks & regards.
> >
> > --
> >
> > Alphonse Ogulla
> > Nairobi, Kenya
> > Kenya Linux User Group http://groups.yahoo.com/group/kenyalinux
> >
> I remember having similar problems, though not how I exactly solved
> them. First try ejecting the device and reconnecting. In this way, the
> partition table gets re-read. If that doesn't help, a good guess is to
> try and partition (and maybe even format) the device with parted (IIRC
> it's not in woody though). Also what happens if you make _two_ FAT
> partitions?
>
I tried formatting both partitions as FAT and experienced exactly the
same behaviour only that the error this time around was:
FAT: bogus logical sector size 0
VFS: Can't find a valid FAT filesystem on dev 08:02
mount: wrong fs type, bad option, bad superblock on /dev/sda2,
or too many mounted file systems.
Tried even mounting the second partition before the first but no
change. Neither did ejecting and reconnecting the device help. Funny,
but I noticed that plugging in the device on a Win2k machine, creates
a removal drive E: of 256mb capacity :-(
Has anyone ever used more than one partition on a USB flash disk or is
this simply impossible?
--
Rgds, Alphonse Ogulla [ Nairobi, Kenya ] Kenya Linux User Group
Reply to: