Is a factory reset enough to wipe a laptop or phone?
By the Innovate Prime Renew team · Updated
Why a reformat doesn't remove data
A quick format or standard reset mostly removes the index that points to your files, not the files themselves. Until that space is overwritten, recovery tools can often rebuild much of what was there.
Why SSDs need a different method
SSDs spread data across memory cells and keep spare areas hidden from the operating system. Software that overwrites the visible drive can't reach those areas reliably. The drive's own Secure Erase or Sanitize command can, because it works at firmware level.
Phones and tablets
Current iPhones and Android devices encrypt storage by default. A factory reset destroys the encryption key, which leaves the remaining data unreadable. For business devices, also remove them from device management, sign out of accounts so activation locks are released, and record each device's reset.
What to do instead
Match the method to the device, verify the result, and keep a record:
- Hard drives: full overwrite with verification.
- SSDs and NVMe: firmware Secure Erase or Sanitize.
- Phones and tablets: cryptographic reset, with account and management checks.
- Anything that fails: physical destruction.
Frequently asked questions
- Can data be recovered after a factory reset?
- On laptops and PCs, often yes, particularly after a quick reset or reformat. On modern encrypted phones, a factory reset makes the data unreadable by destroying the encryption key.
- How many overwrite passes does a hard drive need?
- For modern hard drives, one complete overwrite with verification is considered sufficient by current sanitisation guidance. Multiple passes mostly add time.
This guide is general information for UK organisations, not legal advice. For decisions specific to your organisation, check with your compliance or legal team.