Dragging files to the bin does not delete them. Neither does a quick format, and neither — on an SSD — does the old advice of writing zeros over the whole drive a few times. If you are about to sell a drive on eBay, hand a laptop to a recycler, or post a failing SSD back under warranty, the difference between "looks empty" and "is actually gone" matters. The good news is that the correct method on a modern SSD takes seconds rather than hours, because it does not involve scrubbing anything. This guide covers what actually works, what does not, and the specific steps for Windows, macOS and a drive you have already pulled out of a machine.
On a mechanical hard drive, sector 500 is a physical place on a physical platter. Write zeros to it and the previous magnetic state is gone. That is why decades of advice said to run a multi-pass overwrite and be done with it.
An SSD does not work that way. The controller sits between the address your operating system asks for and the flash cell that actually holds the data, and it moves things around constantly. Wear levelling spreads writes across cells so no single block dies early. Over-provisioning keeps a chunk of flash — often 7 to 28 per cent of the raw capacity — permanently hidden from the operating system as spare area. Blocks retired by the controller are invisible too.
The result is that an overwrite pass only reaches the space the drive is currently willing to show you. Copies of your data can sit in over-provisioned or retired blocks that no amount of writing zeros will ever touch. This is not a fringe concern: the US standard that most data-destruction policies are built on, NIST SP 800-88, explicitly treats overwriting as inadequate for flash storage and points to firmware-level sanitize commands or cryptographic erase instead.
There is a second reason to skip the overwrite: it is bad for the drive. A full-capacity write cycle burns through endurance you paid for, and on a large drive it can take hours. The correct method is faster and costs the drive nothing.
Nearly every SSD sold in the last decade encrypts everything it writes, whether you asked it to or not. The controller holds a media encryption key and scrambles data on the way in. A cryptographic erase tells the drive to throw that key away and generate a new one. Every cell still holds data, but it is now permanently undecodable noise.
This is why the job takes under a second. It is also the method NIST treats as a valid purge for flash, and the one behind Apple's "Erase All Content and Settings".
The catch worth knowing: cryptographic erase is only as good as the key handling. If you separately encrypted the drive with BitLocker or FileVault and a copy of that recovery key is sitting in your Microsoft or Apple account, that is a key you still control, not one the buyer does. That is fine for resale. It is worth remembering if your threat model is more serious than a stranger on eBay.
ATA Secure Erase (on SATA drives) and NVMe Sanitize or Format NVM (on NVMe drives) are instructions sent to the drive's own controller, telling it to reset every block including the hidden spare area. Because the controller runs it, nothing is out of reach.
Block erase typically takes one to five minutes. There is also an overwrite-based sanitize mode, which can run for hours on a large drive and is the one option here you can safely ignore.
For a drive that no longer responds, or one that held something you genuinely cannot risk, destruction is the fallback. On an SSD that means destroying the NAND packages themselves, not bending the circuit board — a drilled hole through the middle of a 2.5-inch SSD may miss every chip. Take it to a WEEE recycling point that will do it properly rather than attacking it in the garden.
If you are selling the whole machine, use the built-in reset. Go to Settings, then System, then Recovery, and choose Reset this PC. Pick Remove everything, then choose Cloud download or Local reinstall, and on the additional settings screen turn on the option to clean the drive. That option issues the appropriate erase to the drive rather than a simple format, and it leaves the buyer with a working Windows install.
Before you do any of this, check whether the drive was encrypted. On most Windows 11 machines set up with a Microsoft account, device encryption is switched on silently from the first sign-in, which is genuinely helpful here — it means the data was never sitting in plaintext to begin with. You can confirm under Settings, Privacy and security, Device encryption. If it is on, a reset is more than adequate for a private sale.
If you are keeping the PC and only replacing the drive, clone first and wipe second. Our guide on how to clone your old hard drive to a new SSD walks through getting everything across intact — the wipe is only safe once you have booted successfully from the new drive and checked your files are really there.
Every major brand ships a free utility that can issue a proper sanitize, and this is the most reliable route for a drive you have already removed:
The recurring gotcha is the boot drive. You cannot securely erase the drive Windows is currently running on. Either pull it and connect it to another machine over a USB caddy, or use the bootable USB the manufacturer's tool creates.
On an Apple Silicon Mac or an Intel Mac with a T2 chip, System Settings has an Erase All Content and Settings option that does a cryptographic erase of the internal storage and returns the machine to setup. That is the correct and complete answer for the internal drive — there is nothing further to add.
For an external SSD, open Disk Utility, click View and choose Show All Devices so you can select the physical drive rather than just its volume, then Erase. Choose APFS or exFAT depending on where the drive is going next, and if the drive was previously encrypted with FileVault the erase discards the key along with it.
Disk Utility's Security Options slider, with its multiple overwrite passes, is greyed out for SSDs — and that is correct behaviour, not a bug. Those passes belong to the mechanical era.
If what you are wiping is a spinning disk rather than flash, the old advice holds after all. A single full overwrite pass is enough; the multi-pass rituals people still repeat were written for drive densities that stopped existing years ago. NIST treats one pass as a valid clear for magnetic media.
The practical difference is time. A single pass over a modern high-capacity HDD can run overnight, so start it before you go to bed rather than half an hour before the courier arrives. Windows will do it from the diskpart command line using clean all, or you can use the drive maker's tool. If you are weighing up what to replace it with, the SSD vs HDD comparison covers where each still makes sense — spinning disks remain far cheaper per terabyte for bulk storage, even after the 2026 price rises.
Sending a drive back under RMA is the case people most often get wrong, because a dying drive may refuse to accept a sanitize command at all.
If the drive still enumerates, run the manufacturer's sanitize before you post it. If it does not, you have a judgement call: most manufacturers' terms make you responsible for the data on a returned drive, and none of them promise to wipe it. If the contents genuinely matter and the drive is unreachable, writing off the warranty and destroying the drive is sometimes the cheaper mistake to avoid.
The lesson to take forward is that this is much easier to solve before it happens. A drive that was encrypted from its first day is already a solved problem, because the data was never readable without a key you hold.
A securely erased SSD is worth selling. Buyers will ask about drive health, so check the SMART figures and the power-on hours before you list it, and quote them honestly — a drive with plenty of endurance left is worth more than a vague description.
If you are replacing rather than reselling, wipe the old drive only after the new one is installed and verified, never before. Current pricing on replacements is on our live SSD deals page, and if the drive you are retiring was an external, the external drive comparison is the place to see what the same capacity costs today.
Finally, do not put a dead drive in the household bin. Storage devices are electrical waste, and UK retailers and council recycling centres take them free of charge. Many will destroy the media on site if you ask.
For a wider view of what to buy next across formats and capacities, our 2026 storage buying guide breaks down where the money currently goes furthest.
Prices below are checked regularly and reflect current UK retailer pricing at the time of writing.
Browse the latest UK prices on EasyDriveCompare and find the best deal for your next storage upgrade.
Compare Internal SSD Prices →