A drive is not showing up

Work out whether it is a connection problem, a configuration one, or a failing drive.

Safety level: caution · Time: about 15 minutes · Level: intermediate

A drive that has vanished is either not connected, not initialised, or failing. These need very different responses, so identify which before doing anything.

Applies to

Internal drives in a desktop or laptop, new or previously working.

Before you start

If this drive holds data you need, stop and read this paragraph. Every additional power cycle on a failing drive reduces the chance of recovery. If the data matters more than the drive does, do not keep retrying — power it off and bring it in. Repeated attempts are the most common reason recoverable data becomes unrecoverable.

Step 1: is it in the BIOS?

Restart and enter the BIOS (usually Del or F2 during startup). Look at the storage list.

Present in the BIOS — the hardware is fine and this is a configuration problem. Go to step 2.

Absent from the BIOS — this is hardware. Go to step 3.

Step 2: present in BIOS, absent in Windows

1. Right-click Start → Disk Management.
2. A new drive shows as Unallocated. That is expected: initialise it as GPT, then create a Simple Volume. Nothing is wrong.
3. A previously working drive showing as Unallocated is different and serious — the partition table has gone. Do not initialise it. Initialising is what makes the data genuinely hard to recover. Stop here.
4. A drive with a healthy partition but no letter just needs one assigned: right-click → Change Drive Letter and Paths.
5. RAW instead of NTFS means a damaged filesystem. If the data matters, stop.

Step 3: absent from the BIOS

1. Power off and unplug. Hold the power button five seconds.
2. Reseat both cables on a SATA drive — data and power. Try a different SATA cable and a different power lead from the supply; both fail.
3. Reseat an M.2 drive and check the retaining screw is present.
4. Try a different port. SATA ports fail individually. Note that populating a second M.2 slot disables specific SATA ports on many boards — check the manual before assuming the port is dead.
5. For a new drive, recheck the protocol. An NVMe drive in a SATA-only M.2 slot fits perfectly and never appears. This is the most common cause with a new purchase.

Expected result

Either the drive returns, or you know it is a hardware fault rather than a setting.

Warning signs of a failing drive

Stop and bring it in if you notice any of these:

• Clicking, ticking or grinding from a mechanical drive — power it off now
• The machine freezes for long periods when accessing it
• It appears and disappears between restarts
• SMART warnings at startup
• Files that were there are missing or will not open

An intermittent drive is a drive in the process of failing. The window for recovery is open now and closing.

Stop and ask a technician if

• The data matters and the drive is not behaving normally
• A previously working drive shows as Unallocated or RAW
• There is any mechanical noise

We can attempt recovery, and the earlier we see it the better the odds. What we can achieve depends entirely on how the drive has failed — nobody can promise recovery, and anyone who does is guessing.

Read this next

• Check M.2 key, length and protocol before buying a drive — The commonest cause: an M.2 drive in a slot that cannot speak its protocol.
• 2.5-inch SATA, M.2 SATA and M.2 NVMe: the difference that matters — Which kind of drive you have decides where it should appear.
• Fit an M.2 NVMe drive in a desktop — The fitting steps, if the drive is new and this is the first boot.

Still stuck?

If anything here does not match what you are seeing, stop rather than force it. Contact us · Book a repair

Last reviewed 2026-08-19.

Written by Krishna Patel for RJ Digital Alliance, 19 August 2026