- An SSD is faster, quieter and more shock-resistant than a hard drive.
- Hard drives cost less per terabyte and still suit large archives and backups.
- Whichever you choose, keep a second copy of important files.
The short answer
For the drive that runs your computer, choose a solid-state drive (SSD). It starts programs and files much faster than a hard disk drive (HDD) and makes an older computer feel new. For storing large amounts of data cheaply, such as old videos and backups, a hard drive can still be the sensible choice. Many people use both.
How they work
A hard disk drive stores data on spinning magnetic platters, read by a moving arm, a bit like a record player. A solid-state drive has no moving parts and stores data in flash memory chips, like a very large and fast memory card. That single difference explains almost everything else in this guide.
Side-by-side comparison
| Feature | SSD | HDD |
|---|---|---|
| Speed | Very fast. A SATA SSD reaches about 500 MB/s and an NVMe SSD can be several times faster. | Slower, usually around 100 to 200 MB/s. |
| Start-up and loading | Seconds | Noticeably longer |
| Noise | Silent | Spinning and clicking sounds |
| Shock resistance | Good, because nothing moves | Weaker, and drops can damage it |
| Power use | Lower | Higher |
| Price per terabyte | Higher | Lower |
| Best for | Operating system, apps, projects in progress | Large archives and backups |
Types of SSD
- SATA SSD: uses the older drive connection and is a simple upgrade for many older laptops and desktops.
- NVMe SSD: a smaller stick that plugs into a special slot and offers the highest speeds. Check that your computer has the slot before buying.
Lifespan and reliability
Flash memory wears out after many writes, but modern SSDs are rated for years of normal use, far more than most people ever write. Hard drives can fail suddenly because of their moving parts, especially after knocks or years of heat. Neither type is permanent. Any drive can fail without warning, so backups matter more than the type you choose.
A good rule is the 3-2-1 backup rule: keep three copies of important files, on two different kinds of storage, with one copy off-site or in the cloud.
Which one should you buy?
- Laptop or desktop for daily use: an SSD of 256 GB to 1 TB.
- Music producers and video editors: an SSD for the system and active projects, and a larger external drive for archives.
- Home backup: an external hard drive is a cheap way to keep a spare copy, together with a cloud copy.
- Old slow computer: replacing the hard drive with an SSD is often the best upgrade for the money.
Upgrading safely
- Back up everything before you start. See how to back up your phone and laptop.
- Check your computer’s drive type and the connector it uses.
- Clone the old drive to the new one using the software the SSD maker provides, or do a fresh install.
- Keep the old drive as a spare backup, after wiping private data if you plan to give it away.
Quick checklist
- Choose an SSD for your main drive
- Use a hard drive for cheap bulk storage
- Check SATA or NVMe compatibility before buying
- Back up before any upgrade
- Keep a second copy of important files
Key points to remember
The SSD is the closest thing to a free speed upgrade. If you are comparing laptops, see how to how to choose a laptop for work or school for the rest of the checklist.
