'chnod' doesn't work with flash usb

thelonius · 10-05-2006, 08:30 PM

Hello,

I mount flash usb disk with 'mount /dev/sda1 /mnt/flash' as root, all others can read and execute, but not write in this directory. When i run 'chmod a+wrx', the rights remain the same.

What's wrong ?

Thank you.

Dutch Master · 10-05-2006, 08:43 PM

Did you unlock the write-protection (switch) on the usb disk?

thelonius · 10-05-2006, 08:48 PM

lol

in fact, i can write when i'm root

this is what i'm doing - i prepare data as normal user, but then copy it as root

Dutch Master · 10-05-2006, 08:58 PM

Try

Code:

chmod 777 /mnt/flash
ls -l /mnt/flash

Should work...

thelonius · 10-05-2006, 09:02 PM

oups... is '777' really different from 'a+wrx' ?...

anyway, it doesn't work

Dutch Master · 10-05-2006, 09:59 PM

No, it's equal. Strange it didn't work, it's the least restrictive set of permissions on a file. What did the ls -l command tell you?

thelonius · 10-09-2006, 08:45 PM

in both cases (before and after 'chomod') it's

drwxr-xr-x 5 root root 8192 1969-12-31 19:00 flash

cs-cam · 10-09-2006, 09:15 PM

Is the filesystem on the USB device vfat? If so chmod won't work, vfat doesn't support unix-like permissions. umount the device, then chmod /mnt/flash and use the umask option when mounting to allow users to write to the device.

thelonius · 10-09-2006, 09:28 PM

I'm not sure about the filesystem - I mount with 'mount /dev/sda1 /mnt/flash'

'/mnt/flash' is 'drwxrwxrwx' before mount, and 'drwxr-xr-x' after mount.

should I format disk to ext2 ?

cs-cam · 10-09-2006, 11:02 PM

When it's mounted you can type 'mount' into a terminal to see the filesystem. If you change it to ext3 (ext2 = only if necessary) then it won't be accessible in 99.4% of Windows machines so if you wanted to share something you're killing your chances. Using the umask option will work fine for you and let you stay with vfat, check Google for exact usage but it's very easy

thelonius · 10-09-2006, 11:10 PM

thanks

hope it helps