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New SSD Not Showing Up? Here's the Fix

You installed the drive, closed the case, booted up — and it's nowhere. Don't panic and don't box it up for a return yet. Nine times out of ten this is a five-minute fix, not a dead drive. The first step is figuring out whether it's a Windows problem or a hardware problem, and that takes about thirty seconds.

The BIOS sees it — initialize it in Windows

This is the most common case by far. A brand-new drive has no partition on it, so Windows won't show it in File Explorer until you initialize and format it. Two minutes:

1. Right-click the Start button and choose Disk Management (or press Win+R, type diskmgmt.msc, Enter).
2. Find your new drive in the lower pane — it'll show as "Not Initialized" or as unallocated space, with the right capacity. (If you're unsure which disk is the new one, match the capacity — your 1TB drive is the one showing ~931GB.)
3. Right-click the disk label on the left and choose Initialize Disk. Pick GPT when it asks — that's the modern standard, and the right choice for any drive over 2TB or any Windows 11 machine.
4. Right-click the unallocated space and choose New Simple Volume. Accept the defaults, pick NTFS, check "Perform a quick format," and finish. Give it a drive letter if it asks.
5. The drive appears in File Explorer, ready to use.

Warning: initializing and formatting erases whatever is on the drive. On a brand-new drive that's nothing. On a drive that already has data, stop — this is the wrong fix, and the drive's problem is elsewhere.

The BIOS doesn't see it — the hardware checklist

Work through these in order. Most of the time the answer is the first one.

• Reseat the M.2 drive. Power off, open the case, take the drive out and put it back in. M.2 drives need to be fully slid into the slot — a drive that's in most of the way looks installed and isn't. Push it in until the notch is fully seated, press it down, and screw it in.
• Try the other M.2 slot. Some boards have slots that share lanes with other ports, or a slot that's disabled in certain configurations. The second slot is a free test.
• Check the heatsink situation. If the drive has its own heatsink built in — like the Lexar NM790 in our Mid-Range Build — make sure you didn't also stack the motherboard's heatsink plate on top of it. The two can push the drive out of alignment. One heatsink or the other, never both.
• SATA drive? Check both cables. A 2.5" SATA drive needs a data cable to the motherboard and a power cable from the PSU. Both have to click in fully. Try a different SATA port on the board and a different SATA power plug if you have a spare.
• Check the motherboard manual for slot quirks. On some boards, using a particular M.2 slot disables a SATA port (or the reverse), and a couple of slots only work with certain drive types. The manual's storage section spells it out — it's the one page worth reading.

Still nothing?

• Try the drive in another PC if you can. If a second machine sees it, the problem is your board or slot, not the drive. If nothing anywhere sees it, the drive itself is the problem.
• Check for a firmware update from the drive maker's site — occasionally a new drive needs one to play nice with a particular board. Only do this if the drive is visible somewhere; you can't update firmware on a drive nothing can see.
• Return it under warranty. Dead-on-arrival drives happen, and every drive we recommend carries a multi-year warranty — 3 years on the Kingston NV3, 5 years on the Lexar NM790 and WD Black SN850X. A drive that nothing can see, in any machine, is a warranty claim, not a troubleshooting project.

The short version