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Try using the 'fuser -m /dev/sda1' to identify the pid of the process which has the lock. Also, make sure that you don't have a file manager window open on the device, and non of the shells have their present working directories on /mnt/usbstick or one of its subdirectories.
I prefer to use the uid= and/or the gid= options to control access and permissions on vfat devices. Also, I think you had a typo of unmask rather than umask. ( Or it's the first time I've seen that option )
OK, I stole this sig...
How does a UNIX Guru have sex ?
* unzip; strip; touch; finger; mount; fsck; more; yes; fsck; fsck; fsck; umount; sleep;
The uid and gid mount options allow you to set the ownership of the drive. You can use either the UID and GID numbers or use the names instead. This information cannot be set on fat32 or ntfs drives with the chown and chgrp commands as is the case with native file system types such as ext3 and Reiserfs, and so it is set during the mount process.
Setting the group ownership allows you a finer control over who can access a mounted drive. For example, suppose you have a 'parents' group. Then if you are at the computer and your wife is connected remotely, you both can access the partition, but users in the 'kids' group will not be able to.