Unlock read-only USB key A free 8GB USB key given to me shows up in Snow Leopard as read-only.

$ mount
/dev/disk1 on /Volumes/USB DISK (ntfs, local, nodev, nosuid, read-only, noowners)


How can I mount it read-write? According to the provider of the USB key:

"The USB needs to be unlocked. Right click USB-properties-security-select everyone-edit-permissions for everyone-Allow full control"

But I think these must be instructions for a different OS.

I'd be fine with reformatting it - there's nothing valuable on it.

Attempting to force the issue with mount doesn't seem to work:

$ sudo mount -w -t ntfs /dev/disk1 "/tmp/USB"
$ touch /tmp/USB/foo
-bash: foo: Read-only file system
It's read-only because it's formatted with NTFS (the Windows filesystem), which OS X can only read without the help of third party software. If reformatting isn't a problem, then that's likely the easiest way to go. If you need to transfer between OS X and Windows with the stick, use the FAT filesystem. If you're just using it with Macs, the defaults will work fine.