USB storage devices

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USB Sticks

This document describes how to use the popular USB memory sticks with Linux. However, it is also valid for other devices such as digital cameras that act as if they were just a USB storage.

Getting a kernel that supports usb_storage

If you do not use a custom-made kernel, you are ready to go, for all Arch Linux stock kernels are properly configured. If you do use a custom-made kernel, ensure it is compiled with SCSI-Support, SCSI-Disk-Support and usb_storage. If you use hotplug, you may just plug your device in and the system will automatically load all necessary kernel modules. Otherwise, you can do the same thing manually:

# modprobe usb-storage
# modprobe sd_mod      (only for non SCSI kernels)

Mounting USB memory

After inserting the stick you can mount the device as root with

# mount /dev/sda1 /mnt/usbstick

Note that the directory you mount the stick into must exist before you issue the mount command.

Repartitioning the USB memory

Sometimes the stick is seperated in up to four partitions, and Linux can't read anything. To fix this you have to repartition the stick with fdisk. Make sure that there are no files left on the stick (if you used it before in Windows, Mac OS or anywhere else). Type:

# modprobe usb_storage
# fdisk /dev/sda

Delete all available partitions (d and partition number), create a new partition with n (I would suggest you use a single partition), press q to write everything and quit.

Create a filesystem on the stick:

# mkfs.vfat /dev/sda1

If you do not have mkfs.vfat on your system then use pacman to install dosfstools:

# pacman -Sy dosfstools

Now you can mount or unmount it as mentioned above.

Mounting the USB stick as normal user

If you want non-root users to be able to mount a USB memory stick, add the following line to your /etc/fstab file:

/dev/sda1 /mnt/usbstick vfat noauto,user 0 0