Probably because it's a dos filesystem on the usb drive.
Try copying them to /dev/shmem and then do the chmod.

-seanb

On Fri, Apr 06, 2012 at 11:54:00AM -0400, Ismail Muse wrote:
> Hi,
> 
>    I am running qnx from CDROM drive and the files to run are on a USB drive.
> 
>    I am trying to change permission on the files but it seem not changing.
> 
>   I type
> 
>   chmod 755 "filename"   ---it seem the command was accepted but when I do
>   ls -l the permission stays at -rw-rw-rw-
> 
> Pls any suggestions
> 
> 
> 
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> 
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> http://community.qnx.com/sf/go/post92481
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