How do I change permissions on a USB drive?

Hi
I have a thumb drive that is MS-DOS (FAT12). It only gives me permission to read.
Is it possible to change the permission to read write?
I don't mind if I have to reformat the drive.
AS

For a Mac do this:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.

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or like this
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This is similar to the other thread about USB hard drive permissions, but I didn't want to hijack.
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[ali@misbarch ~]$ cd /media/disk
[ali@misbarch disk]$ ls -l
total 16
drwx------ 2 root root 16384 2008-05-08 01:14 lost+found
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stojic wrote:
There is a slightly better solution: change the group of /media/disk to storage, change permissions to 775 and add users that need to be able to write to disk to the storage group (you need to log out and log in that users before changes are visible).
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Another look at how to: "Share an iPhoto Library in Tiger using ACL's"
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edited.

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How do I change permissions on a USB drive?

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