How long will files last on CDs, hard drives and flash storage?

How long will a CD, hard drive or USB stick keep your files? There is no single reliable expiry date. Media type, manufacturing quality, wear, handling and storage conditions all affect whether a file remains readable.

The practical goal is to keep several usable copies and move them to current storage before a device or format becomes difficult to read.

Magnetic storage: tapes and hard drives

Audio and video tapes can deteriorate as their materials age. A tape also needs a working, compatible player. If it contains irreplaceable recordings, plan a digital transfer while both the tape and playback equipment are usable.

Hard drives contain moving components and electronics that can fail unexpectedly. Neither a new drive nor an apparently healthy old one should hold the only copy of important files. Check backup jobs and periodically test restoration.

Damaged tapes may require specialist recovery. Do not treat heating a tape as a general home repair method; an inappropriate treatment can cause further damage.

Optical storage: CDs and DVDs

Pressed discs, recordable discs and rewritable discs use different materials. Age, scratches, heat, light and moisture can affect readability. The Library of Congress studies these failure mechanisms; its research does not provide a universal lifespan for every disc.

Copy valuable files from readable discs now, verify the copies and keep them on more than one storage device. An archival-media longevity claim is not a substitute for periodic checks or access to compatible reading equipment.

Read the Library of Congress optical-disc research.

Flash storage: SD cards, USB sticks and SSDs

Flash storage has no spinning disks, but it can still fail. Write wear, electronics, temperature and the condition of the memory affect reliability. A device that is rarely used is not automatically a long-term archive.

Small USB drives and memory cards are also easy to lose or physically damage. Move important recordings and photographs into your regular backup workflow after use.

A practical preservation routine

1. Gather important files from old computers, discs and removable media.
2. Keep copies on separate storage devices and in different physical locations.
3. Open a selection of files and test that a backup can actually be restored.
4. Replace failing media and migrate files when a storage format or reader becomes obsolete.
5. Check cloud retention and recovery terms rather than assuming unlimited backup history.

The Library of Congress recommends keeping copies on different media in separate locations. Its preservation guidance is a useful starting point.

Files.fm cloud storage can provide an off-site copy alongside your other backups. Synchronization, version history and backup are different tools: select and verify the protection you need.