Red Hat Bugzilla – Bug 249272
Can't mount VFAT!!!!
Last modified: 2007-11-30 17:12:11 EST
Description of problem:
Latest kernel does not recognize vfat! My flash drive is vfat but mount command
says it is not. Happens on both my home PC (compiled kernel myself) and work PC
(standard package). Testes on many flash drives. Same problem.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
*** Bug 249132 has been marked as a duplicate of this bug. ***
Created attachment 159797 [details]
fragments from /var/log/messages
First of all, see my note in
Now, some update. USB drive with vfat FS and ATA CD/DVD with ISO FS connected
with ATA/USB adapter can be mounted automatically. However, ATA drive with vfat
FS connected with ATA/USB adapter is not mounted automatically but can be
mounted manually. See attachment with fragments from /var/log/messages
I repeat: I can't mount vfat manually. mount command says that fs type is wrong.
fs autodetection does not work either.
I also run 188.8.131.52 kernel (stock 184.108.40.206-27.fc7) and as follows from my
messages, I see completely different behavior. Just a simple test, could you
please try these commands as root:
modprobe vfat ; cat /proc/filesystems
What do you have in the output?
You know what? I ran cat /proc/filesystems before and after modprobe vfat.
Before there was no vfat and after it was present. So why vfat module does not
But that didn't help. Though vfat is present in /proc/filesystems I can't mount
Here's dmesg | tail
sd 8:0:0:0: [sdb] Mode Sense: 00 00 00 00
sd 8:0:0:0: [sdb] Assuming drive cache: write through
sd 8:0:0:0: [sdb] Attached SCSI removable disk
sd 8:0:0:0: Attached scsi generic sg3 type 0
hfs: unable to find HFS+ superblock
FAT: invalid media value (0x01)
VFS: Can't find a valid FAT filesystem on dev sdb.
FAT: invalid media value (0x01)
VFS: Can't find a valid FAT filesystem on dev sdb
(In reply to comment #5)
> You know what? I ran cat /proc/filesystems before and after modprobe vfat.
> Before there was no vfat and after it was present. So why vfat module does not
> start automatically?
This is normal. vfat as many other modules is loaded automatically on demand.
When not in use for some time, modules are unloaded to free memory.
My question was just to check if vfat is enabled in kernel configuration. Since
vfat module present, this part seems OK.
Regarding your dmesg output, I think we need to wait what kernel maintainers
Could you please try this command:
sfdisk -l /dev/sdb
(Don't try other options in sfdisk!!!)
And what did you try to mount manually? /dev/sdb or /dev/sdb1?
Oh, shoooooot!!! I didn't notice that sdb1 was present (hmmm.. I don't remember
flash drives had /dev/sdxn format. But perhaps that was changed in latest
kernel). sdb1 mounts normally. But wny automatic mount does not work?
This is not a kernel, this is just common USB drives layout. They all have
partition table just like hard drives. Regarding automatic mount, I think this
is the problem with some USB stuff in kernel. Something works, something
I'm really surprised by status of Fedora 7 really... There is no well working
kernel yet: 2.6.21 suffers from bug in libata module which strikes the disk
head every shutdown, in 2.6.22 this bug was fixed but usb stuff seems heavily
broken. If I knew that I would expect more stable Fedora update before
upgrading from FC5. Let's see what kernel maintainers say but I'm afraid I will
do next Fedora major upgrade in 5-6 months after F9 release to settle things
The Source, there will be a new kernel 220.127.116.11-33.fc7 in testing soon. You
also can get it here right now: http://koji.fedoraproject.org/packages/kernel/
18.104.22.168/33.fc7/i686/kernel-22.214.171.124-33.fc7.i686.rpm (make sure you will paste
entire link as it very long and can brake here in bugzilla page). With this new
kernel some problem is solved, some not (see https://bugzilla.redhat.com/
bugzilla/show_bug.cgi?id=249132 for more info). You may try it to check if your
mount vfat bug is fixed.
Hmm, sorry for testing... Does bugzilla allow html in the message? This is a
link to the <a href=http://koji.fedoraproject.org/packages/kernel/
Some update regarding automatic mounting problem... I tested 126.96.36.199-33.fc7
kernel and unfortunately it does not mount Nokia E65 phone automatically (see
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=249132#c5). It mounts USB
flash memory. ATA hard drive connected over ATA-USB adapter: it is mounted
automatically when the drive is connected first time. If I then unmount it
choosing "Safely remove" in the KDE drive icon, remove the USB cable, then
connect it again, the kernel recognizes the drive and partition but it is not
automatically mounted. If I disconnect the USB cable, remove the power from the
drive, then power-on it again and connect USB cable, it is again mounted
automatically. Any idea?
It seems there is a solution for this problem in a discussion regarding bug
I'm 99% this is a dupe of bug 249282 so closing as such.
*** This bug has been marked as a duplicate of 249282 ***