Re: usb disk insists on being readonly
- From: lalawawa <usenet@xxxxxxxxx>
- Date: Thu, 05 Jul 2007 02:08:35 -0000
On Jul 4, 6:05 pm, Roby <r...@xxxxxxxxxxxxxx> wrote:
lalawawa wrote:
Hi, I just bought a 400Mbyte usb disk.
My OS is Ubuntu version 5, I've recently done the updates to it.
My computer is a Sony VAIO PCV-RX270DS that I bought in 2001, with
about 400Mbytes of disk and the usb port is USB 1 (that manual doesn't
say which USB version because I think USB 2.0 wasn't out yet). The
disk is connected through a hub.
The drive is a 400GB Simpletech drive. The specifications make it
clear it's USB 1.1 compatible. All the online technical support
assumes you're on Windows.
When I turn on the disk, it appears in the /media directory by the
filename ' simpletech ' (not spaces before and after the name). The
fstab entry that appears is
/dev/sda /media/usb0 auto rw,user,noauto 0 0
If I cd to /media and do 'ls -ld \ simpletech\ ', I get
dr-x------ 1 wulluw wulluw 4096 2007-02-20 10:25 simpletech
if I go into that directory and do 'ls -la' I get
total 8
dr-x------ 1 wulluw wulluw 4096 2007-02-20 10:25 .
drwxr-xr-x 7 root root 4096 2007-07-04 14:20 ..
dr-x------ 1 wulluw wulluw 0 2007-02-20 10:25 System Volume
Information
if I try 'touch a' it says
touch: cannot touch `a': Read-only file system
if I try 'sudo touch a' it still says
touch: cannot touch `a': Read-only file system
I cd back to /media
$ chmod +w \ simpletech\ /
chmod: changing permissions of ` simpletech /': Read-only file system
$ sudo chmod +w \ simpletech\ /
chmod: changing permissions of ` simpletech /': Read-only file system
Why is it saying the filesystem is readonly when /etc/fstab clearly
says it's rw? What do I have to do to get the disk mounted rw? A
400GB readonly disk with nothing on it isn't very useful.
Any help would be appreciated.
Bill
My guess: the drive is formatted ntfs and the "auto" in the fstab entry
is causing linux to load the ntfs driver (rather than ntfs-3g). The
drive will be painfully slow at usb 1.1. usb2 pci cards are cheap and
do a great job.
I would like to put in a USB 2.0 board, but I absolutely, positively
don't want to make any hardware changes to my box until I'm able to
back up.
In the past, I would back up on CD-ROM using K3B. Then suddenly,
probably as a result of an upgrade, neither K3B nor the CD-ROM Creator
software are able to find my CD burner. Here's my fstab:
$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
/dev/mapper/Ubuntu-root / ext3
defaults,errors=remount-ro 0 1
/dev/hda1 /boot ext3 defaults 0 2
/dev/mapper/Ubuntu-swap_1 none swap sw
0 0
/dev/hdc /media/cdrom0 udf,iso9660 user,noauto 0 0
/dev/hdd /media/cdrom1 udf,iso9660 user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0
/dev/sda /media/usb0 auto rw,user,noauto 0 0
$
$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/Ubuntu-root
37079744 12680436 22515764 37% /
tmpfs 193436 0 193436 0% /dev/shm
tmpfs 193436 12588 180848 7% /lib/modules/
2.6.12-10-386/volatile
/dev/hda1 233335 19153 201734 9% /boot
/dev/sda1 390708800 77912 390630888 1% /media/
simpletech
$
but I don't think upgrading to a 2.0 port is going to change the
permissions of the disk. I think all that would be accomplished by
upgrading to USB 2.0 would be to change my slow 400GB readonly disk
with nothing on it to a fast 400GB disk with nothing on it.
.
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