If your SSD is not detected by your computer's BIOS or UEFI, that's how to tell if an SSD is dead. That is the only definitive sign of a dead SSD; a drive that is detected but malfunctioning is failing, not dead, and requires a different troubleshooting approach.
How to tell if a SSD is dead: the only definitive sign
A dead SSD is one that is completely invisible to your computer's firmware. It does not appear in the BIOS or UEFI, and it is not listed in the operating system's disk management tools. This is different from a failing drive, which is still detected but shows errors, slows down, or crashes intermittently. The distinction is critical because attempting software-based repairs on an undetected drive can permanently erase your data.
Step 1: Check if the SSD appears in BIOS
Restart your computer and press the key displayed on the screen during boot, commonly Del, F2, F10, or Esc, to enter the BIOS or UEFI setup. Navigate to the storage or boot section, where the connected drives are listed. If your SSD is not shown there, even after you have verified the physical connections, then the drive is dead. No further software troubleshooting will bring it back.
Step 2: Reseat cables and try a different port
Power off your computer and unplug it from the wall. Open the case and locate your SSD. Disconnect both the SATA data cable and the power cable from the drive, then reconnect them firmly. Replace the SATA cable with a known-good one if you have it, and connect the SSD to a different SATA port on the motherboard. Also, check the power cable from the PSU; a loose or faulty power connection is a common cause of a drive not appearing.
Step 3: Test the SSD in another computer
If the drive still is not detected, remove it from your computer and connect it to a different, known-working computer. If the second computer also fails to detect the SSD in its BIOS, the drive is dead. If it is detected on the second computer, the problem lies with your original system's motherboard, port, or cable configuration.
Warning: Do not scan an undetected drive
Running CHKDSK, disk repair tools, or any data recovery software on an SSD that is not detected by the BIOS is dangerous. The operating system may issue TRIM commands to the drive, which permanently erases data from NAND cells. This can make previously recoverable data unrecoverable. If the BIOS does not see the drive, do not attempt any software-based fixes. Your only options are to replace the drive or seek professional data recovery services if the data is critical.
If the SSD is detected but not working: signs of failure
If the SSD appears in BIOS but is not functioning properly, you are dealing with a failing drive, not a dead one. Common symptoms include: SMART warnings in the BIOS or operating system, frequent read/write errors, files that disappear or become corrupted, and system crashes or freezes during normal use. A detected drive with a SMART status of "Bad" or "Failing" should be replaced immediately, as it is at high risk of total failure.
Check the SSD in Windows Device Manager and Disk Management
If the SSD is detected in BIOS but not in Windows, open Device Manager by right-clicking the Start button. Expand "Disk drives" and look for your SSD. If the drive is enabled but still not visible in File Explorer, open Disk Management by right-clicking the Start button and selecting "Disk Management." Look for your SSD in the lower pane. If it is online but has no drive letter, right-click the partition and choose "Change Drive Letter and Paths," then "Add" and assign a letter. Do not format the drive unless you have backed up your data, as formatting erases everything.
When to run CHKDSK and update firmware
Only run CHKDSK or update firmware after the SSD is properly detected in BIOS and Windows, and only after you have backed up any important data. To run CHKDSK, open Command Prompt as administrator and type `chkdsk C: /f` (replace C: with your SSD's drive letter). This will scan for file system errors and attempt to fix them. For firmware updates, download the latest firmware from the manufacturer's website using the model number printed on the drive label. Follow the provided instructions exactly, and do not interrupt the update process. Never update firmware on a drive that is not detected, as this can permanently corrupt it.
Final verdict: Is your SSD dead?
If the SSD is not detected in the BIOS after reseating cables, trying a different port, and testing it on another computer, then yes, it is dead and needs to be replaced. If it is detected in BIOS but shows a SMART status of "Bad" or "Failing," the drive is dying and should be replaced immediately to avoid data loss. If it is detected and functions normally, then the original problem was likely a loose connection, a faulty cable, or a motherboard port issue, and the drive is still usable.
