newbie's question on file permission

[Zhengguo Xu]

mount output:

...
/dev/sdb5 on /media/disk type vfat
(rw,nosuid,nodev,uhelper=hal,shortname=mixed,uid=1000,utf8,umask=077,flush)
/dev/sdc5 on /media/disk-1 type vfat
(rw,nosuid,nodev,uhelper=hal,shortname=mixed,uid=1000,utf8,umask=077,flush)

i'm not gonna pretend to understand that. :-(
i want the disk can be read by different users on my pc. all of them should
be able to write/delete some files on it. is it doable?

2008/8/1 Zhengguo Xu <tworiversfolk at gmail.com>

> many thanks!  all of you. how can I change the permission for whole disk?
>
> 2008/8/1 Zhengguo Xu <tworiversfolk at gmail.com>
>
> Thanks a lot, Zack!! it indeed is FAT32 disk. I do need to connect this
>> disk to windows from time to time, but I had the impression that NTFs is not
>> best support by Linx. or am I completely wrong about it? writing to NTFs
>> disk in linux is now perfectly normal?
>>
>>
>> 2008/8/1 POWERS, ZACK <zpowers at umflint.edu>
>>
>>>  Hi,
>>> The reason permissions don't change on your USB stick is because your
>>> USB disk is formatted in a filesystem that does not support POSIX
>>> style file permissions. If its FAT16 or FAT32, which it is most likely
>>> is, it doesn't support any type of file permissions. To solve this
>>> issues you will have to reformat your USB disk to a POSIX compliant
>>> filesystem (NTFS would be the best choice for compatibility with
>>> Windows).
>>>
>>>
>>> -----Original Message-----
>>> From: ubuntu-users-bounces at lists.ubuntu.com on behalf of Zhengguo Xu
>>> Sent: Fri 8/1/2008 2:37 PM
>>> To: Ubuntu User
>>> Subject: newbie's question on file permission
>>>
>>> Greeting all!
>>>
>>> Recently I encounted a strange problem (or it maybe very obvious for
>>> you
>>> guys) while copying files and I'd like to ask a question on file
>>> permission
>>> in linux.
>>>
>>> I have a file, lets say 'biology.ppt' and it has permission as follows
>>> and i
>>> am the owner and it belongs to group 'root'
>>>
>>> -rwx------
>>>
>>> i want to change it to group, say, 'test', and give permissions to
>>> everyone
>>> to read and write and execute, what's wrong when I run the following
>>> command?
>>>
>>> sudo chgrp test biology.ppt
>>> sudo chmod 777 biology.ppt
>>>
>>> nothing happened when i run these commands and i tried them with and
>>> without
>>> sudo. the file still has the permission -rwx------ and root is still
>>> the
>>> group.
>>>
>>> if it matters, the file is on a usb disk mounted in /media
>>>
>>> i also tried to create some file in my home directory and i can change
>>> it as
>>> i want with the same command.
>>>
>>> any help would be greatly appreciated.
>>>
>>>
>>> --
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>>>
>>>
>>
>
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