Error mounting HFS+ volume: unable to find HFS+ superblock

applewax · 05-30-2006, 08:40 AM

Hello,

I have an HFS+ formatted 1 gb flash drive that I'm trying to mount. I have loaded the hfsplus kernel module, no problem, but when I try to mount the flash drive, I get the following error message from the kernel:

Code:

May 30 09:08:35 raptor kernel: attempt to access beyond end of device
May 30 09:08:35 raptor kernel: sda1: rw=0, want=67, limit=63
May 30 09:08:35 raptor kernel: HFS+-fs: unable to find HFS+ superblock

The command I'm using is:

Code:

sudo mount -t hfsplus /dev/sda1 /mnt/flash

Any help would be greatly appreciated. Thanks!

Emerson · 05-31-2006, 04:29 AM

Not all flash drives have partitions, try mounting as sda. Just my two cents.

applewax · 05-31-2006, 08:00 AM

Thanks, but no luck. I've tried /dev/sda, sda1, sda2, sda3, and sda4. The kernel reports the following when I plug it in:

Code:

May 31 08:08:51 raptor kernel:   Vendor: Kingston  Model: DataTraveler 2.0  Rev: 1.00
May 31 08:08:51 raptor kernel:   Type:   Direct-Access                      ANSI SCSI revision: 02
May 31 08:08:51 raptor kernel: SCSI device sda: 1970176 512-byte hdwr sectors (1009 MB)
May 31 08:08:51 raptor kernel: sda: Write Protect is off
May 31 08:08:51 raptor kernel: sda: assuming drive cache: write through
May 31 08:08:51 raptor kernel:  sda: [mac] sda1 sda2 sda3
May 31 08:08:51 raptor kernel: Attached scsi removable disk sda at scsi9, channel 0, id 0, lun 0
May 31 08:08:52 raptor scsi.agent[831]: disk at /devices/pci0000:00/0000:00:1f.4/usb2/2-1/2-1:1.0/host9/target9:0:0/9:0:0:0
May 31 08:08:55 raptor fstab-sync[970]: added mount point /media/Flash for /dev/sda2

I still get the same error. I had previously formatted it with ext3 and it mounted fine, but my new MacBook can't read ext3, so I formatted it with HFS+ to make it compatible. (I really don't want to use vfat.) Any other thoughts on how to mount this HFS+ volume? (Using CentOS 4.0, kernel 2.6.9-5.0.3.EL) Thanks.

Emerson · 05-31-2006, 08:45 AM

> Any other thoughts on how to mount this HFS+ volume?

Not really

You could try to run fdisk on it, perhaps it reveals something. Partition info for instance. I admit I do not know what type of partition table Mac is using. Maybe writing partition table with Linux and formatting under Mac would make it readable? Just toughts ...