Do Unpowered SSDs Lose Data? What JEDEC Standards Say About Wear, Heat and Backups

What the XDA piece claims​

XDA's argument is that SSDs store bits as electrical charge in NAND flash cells, and that this charge can fade when the drive sits without power. Its figures are about one year for QLC NAND, up to three years for TLC, five for MLC and ten for SLC. It also says loss can strike anywhere from one to three years in.

It adds two caveats:

• Most people don't keep drives in drawers for years, so most aren't affected.
• The practical fix is a backup, using the 3-2-1 rule of three copies, two media types and one copy off-site.

The mechanism and the backup advice hold up. The per-cell-type countdown is where it gets shaky.

What the standards and vendors say​

Nothing I reviewed backs those NAND-type timelines as universal guarantees. What exists is a set of minimum qualification conditions.

• JEDEC JESD218: A consumer SSD must hold its data for one year at 30°C after power is cut, while an enterprise SSD need only manage three months at 40°C. These figures are measured at the end of the drive's rated write life. So they are worst-case floors for a worn drive, not a predicted failure date. A fresh, lightly used drive should do better.
• Dell: Its support article on PowerEdge servers (last modified May 14, 2026) says the JEDEC standards require SSD/NVMe drives to retain data for a minimum of three months powered off, at maximum rated endurance. It lists three factors that reduce retention: more P/E cycles, higher NAND temperature over the drive's life, and warm power-off storage. Dell says powered-off drives should be kept at or below 40°C (104°F).
• NetApp: Its knowledge base says NAND-based SSDs slowly leak charge when left without power. It says the time until data is at risk depends on wear and storage temperature. Its two-to-three-month guidance is written for ONTAP storage systems, not home PCs.
• Intel: A 2012 application note covers the same ground. It describes charge loss in flash cells, says temperature strongly affects it, and says prior wear makes retention worse. It also says active drives can move and effectively refresh data internally, which can't happen while a drive is unplugged. That statement is about Intel SSDs. It isn't a guarantee for every consumer drive.

Why temperature and wear matter more than cell type​

Cell type matters, since QLC packs more levels into each cell and has less margin. But the sources point to wear and heat as the bigger levers.

Two outside figures show how much heat matters:

• A patent document citing JEDEC acceleration models gives retention for a lightly used client SSD as falling from 404 weeks at 25°C to just eight weeks at 55°C.
• A Dell patent filing says a new unpowered SSD might retain data for around seven years, while an end-of-life QLC drive might manage only a month.

Those are illustrative engineering numbers, not promises for your drive. Still, they show that "one year" and "three years" are the wrong kind of answer. A cool, barely used drive and a hot, heavily written one live in different worlds.

Does this affect your PC?​

The sources draw a line between a PC you power off for a while and an archive you shelve.

• Routine PC use: A laptop or desktop that is switched off for days or weeks is not what these warnings are about. A drive that gets regular use is also likely to be refreshed in the background.
• Archive drives: A spare SSD, a "just in case" external drive, or a drive pulled from an old machine and shelved is the risky case. This matters most if it is heavily worn or stored somewhere warm, like a loft or a car.
• Servers and enterprise gear: Dell advises its covered systems be powered up every 2.5 months for at least three weeks. It also advises that servers in storage for over three months be decommissioned and backed up until they return to service. That is vendor-specific enterprise advice, not a household rule.

One more caution on XDA's framing: it says HDDs are more resistant to power loss and suggests tape or M-Disc. The sources I reviewed don't compare long-term reliability across those media, so treat that as unproven here. One outside guide notes that a hard drive kept cool and dry usually holds its data for years, but its motor can fail to spin up after long storage.

What to do with your drawer SSDs​

1. Don't keep the only copy on an unpowered SSD. Every source points to redundancy as the safe approach.
2. Plug in drives you care about and check the files. Copy the data somewhere else first if it matters. Plugging a drive in is not the same as a verified backup. Dell says refresh tasks need time, or a read of all used cells, and nothing guarantees an arbitrary consumer SSD will repair marginal data.
3. Look up your drive's vendor guidance. "TLC" or "QLC" on the box doesn't tell you the retention window. Wear, temperature and design all matter.
4. Store drives cool. Heat is the factor sources agree on most. Avoid hot rooms, attics and parked cars.
5. Follow 3-2-1 for anything irreplaceable. That means three copies, two kinds of storage and one off-site. This is a general best practice, not a finding from the retention research. A PC, a NAS and a cloud copy is one easy way to meet it.
6. Replace aging archive drives on a schedule. One backup guide suggests plugging archive SSDs in at least once a year and replacing them around year five. That is one publisher's rule of thumb, not a standard.

Bottom line​

XDA is right that "non-volatile" doesn't mean "forever," and right that a lone, forgotten SSD makes a bad archive. But the exact one-to-three-year countdown isn't supported by the standards. The JEDEC figures are minimums for worn drives under specified conditions. Your actual margin depends on the drive, its wear and how warm the drawer is. If the data matters, back it up, and don't assume a drawer will keep it safe.