How to Mount USB Drive in Linux

Mounting a USB drive in Linux is straightforward once you understand how the system names devices and where it attaches them. This guide walks through identifying, mounting, and safely removing a USB drive from the command line, plus the automatic options most desktops provide.

Step 1: Identify the USB Device

When you plug in a USB drive, the kernel assigns it a device name like /dev/sdb, with partitions numbered /dev/sdb1, /dev/sdb2, and so on. To see them:

Read also: Linux Network Commands Every Admin Should Know

• lsblk — lists all block devices in a tree, showing size and current mount points. This is the clearest view.
• sudo fdisk -l — shows detailed partition tables for every disk.
• sudo dmesg | tail — run this right after plugging in the drive to see which device name the kernel just assigned.

Look for a device whose size matches your USB stick. A 32 GB drive showing up as /dev/sdb1 is your target.

Step 2: Create a Mount Point and Mount

A mount point is just an empty directory where the drive’s contents will appear. Create one and then attach the partition:

1. sudo mkdir -p /mnt/usb — create the directory.
2. sudo mount /dev/sdb1 /mnt/usb — mount the partition there.

Now browse the files with ls /mnt/usb. For most modern drives the filesystem is auto-detected, but you can be explicit with the -t flag, for example sudo mount -t vfat /dev/sdb1 /mnt/usb.

Handling Different Filesystems

• FAT32 / exFAT — common on USB sticks. exFAT may need the exfatprogs or exfat-fuse package.
• NTFS — Windows drives. Install ntfs-3g for full read/write support.
• ext4 — native Linux. Mounts without extra packages.

Step 3: Mounting With Correct Permissions

By default a FAT or NTFS drive may be owned by root, preventing your user from writing. Mount with your user and group IDs to fix this:

sudo mount -o uid=$(id -u),gid=$(id -g) /dev/sdb1 /mnt/usb

Find your IDs at any time with id -u and id -g. For ext4 drives, ownership is stored in the filesystem itself, so use chown after mounting instead.

Step 4: Safely Unmount the Drive

Never pull out a USB drive without unmounting first, or you risk corrupting data still sitting in the write cache. To detach it cleanly:

• sudo umount /mnt/usb — unmount by mount point, or use the device name sudo umount /dev/sdb1.
• If you get a “target is busy” error, run lsof /mnt/usb to find what’s using it, or simply cd out of the directory first.
• sync — forces any buffered writes to flush to disk before removal.

Automatic Mounting on the Desktop

On GNOME, KDE, and most desktop environments, the udisks2 service mounts USB drives automatically under /run/media/yourname/ the moment you insert them. From a terminal you can replicate this without root using udisksctl mount -b /dev/sdb1 and unmount with udisksctl unmount -b /dev/sdb1. If you want a fixed drive to mount at every boot, add an entry to /etc/fstab using the drive’s UUID (find it with sudo blkid) for reliability.

Frequently Asked Questions

How do I know which device name my USB drive got?

Run lsblk before and after plugging it in, or check sudo dmesg | tail immediately after insertion. The new entry, usually /dev/sdb1 or similar, is your drive.

Why can’t I write to my USB drive after mounting?

FAT and NTFS drives often mount as root-owned. Remount with -o uid=$(id -u),gid=$(id -g), or for NTFS make sure the ntfs-3g package is installed for write support.

What does “target is busy” mean when unmounting?

A process still has the drive open, or your shell is inside the mounted directory. Run cd ~ to leave it and use lsof /mnt/usb to identify any lingering programs, then unmount again.

Do I always need sudo to mount a USB drive?

The mount command needs root, but udisksctl mount and desktop auto-mounting let you mount removable media as a normal user without sudo.