The warning always arrives at the worst moment: not enough free space, with a 90GB update half downloaded. A PS5 can keep games in three different places, and they are not interchangeable — one of them will not run a PS5 game at all. Working out which problem you actually have, before you shop, is the difference between a fix and a wasted purchase.

What the built-in SSD is for

The internal drive is the only storage the console treats as home. Every PS5 game launches from it, or from an M.2 drive fitted in the expansion bay. Nothing else will do.

How much you started with depends on which console you bought:

  • Original PS5 and PS5 Digital Edition: 825GB
  • The slimmer models introduced in 2023: 1TB
  • PS5 Pro: 2TB

Sony notes that a portion of the SSD is reserved for system software, so the usable figure is lower than the number on the box, and what is left has to cover game installs, saves, screenshots and video captures. Large games now routinely run past 100GB and the biggest shooters past 200GB once every mode is installed, so a handful of them fill an 825GB console between them.

The built-in drive is not user-replaceable, so the expansion bay is the only place Sony intends you to add fast storage.

Try this before you spend anything

Storage is the upgrade most people buy a year too early. Work through the free options first, because on plenty of consoles they recover enough room to push the problem back another twelve months.

  • Look at what is actually installed. Settings > Storage shows the breakdown. Most people find two or three games they finished months ago and never uninstalled.
  • Delete without agonising. A digital game stays in your library to re-download, and a disc game reinstalls from the disc. You are deleting an install, not a purchase.
  • Split the big games up. Several large titles let you remove parts you do not use — a completed campaign, a multiplayer mode you never touch, language packs you will never hear. Sony’s guide to managing storage space shows where those options live.
  • Clear the Media Gallery. Captures accumulate silently and are counted separately from games.
  • Back up saves first if you subscribe to PlayStation Plus. Cloud saved-data storage means you can clear a game with no hesitation at all.

Do all of that and if you are still short, the money is now well spent rather than guessed at.

M.2 NVMe expansion: what Sony actually requires

The PS5 has an internal bay for a second drive, and a game installed there behaves exactly as it would on the built-in SSD. This is the only upgrade that adds space PS5 games can run from.

Sony’s specification is precise, and a drive that misses any part of it becomes a returns job rather than an upgrade. From Sony’s own installation guide:

  • Interface: PCI-Express Gen4 x4 M.2 NVMe SSD (Key M)
  • Capacity: 250GB to 8TB
  • Speed: a sequential read speed of 5,500MB/s or faster is recommended
  • Cooling: effective heat dissipation with a cooling structure, such as a heatsink and a heat transfer sheet, either built in or fitted separately

Sony’s wording on that last point is blunt: do not use an M.2 SSD without a heat-dissipation mechanism.

The size limits are where people come unstuck

  • Width up to 25mm
  • Lengths of 2230, 2242, 2260, 2280 or 22110 — 2280 is by far the most common
  • Total thickness up to 11.25mm, made up of up to 8.0mm above the board and up to 2.45mm below it

Thickness is the figure worth checking twice. A bare drive is nowhere near the limit; the same drive with a tall aftermarket cooler bolted on can be over it. The measurement covers drive and heatsink together, and that separate 2.45mm allowance underneath is why double-sided heatsinks need reading carefully. Every storage listing on RozGamer.co.uk names the form factor and says whether a heatsink is already fitted, and the rest of the range sits under PlayStation accessories.

The speed figure is a recommendation rather than a hard gate — the console will warn you after formatting if a drive is too slow — but a drive well below 5,500MB/s is not the upgrade you thought you were paying for.

USB drives: roomy and cheap, with one catch

Plug a USB drive in, format it as extended storage, and you get a large overflow area for a fraction of the cost per terabyte. Sony asks for SuperSpeed USB 5Gbps or later, from 250GB to 8TB, and is careful to add that not all devices are guaranteed to work.

Then comes the sentence that decides everything:

PS5 games can’t be played directly from USB extended storage.

You can move a PS5 game across, and it genuinely frees the space, but playing it again means copying it back to console or M.2 storage first. That copy is far quicker than pulling 100GB back down a home broadband line, which is the real case for a USB drive: it is a shelf, not a bookcase.

PS4 games work the other way round. Those play directly from USB, so a drive is immediately useful if a decent slice of your video games collection is last-generation.

Two practical points from Sony’s USB extended storage page: connect the drive to one of the console’s SuperSpeed USB 10Gbps ports and never through a hub, and only one extended storage drive can be connected at a time. Before unplugging, switch the console off or use Settings > Storage > USB Extended Storage > Safely Remove from PS5. Formatting wipes the drive, so move anything you want to keep off it beforehand.

Internal, M.2 and USB side by side

Built-in SSD M.2 NVMe expansion USB extended storage
Capacity 825GB, 1TB or 2TB by model 250GB to 8TB 250GB to 8TB
Play PS5 games from it Yes Yes No — copy back first
Play PS4 games from it Yes Yes Yes
Cost per terabyte Fixed with the console Dearest of the three Cheapest, especially mechanical drives
Fitting Not user-replaceable Screwdriver, inside the console Plug in and format
Best for The games in rotation A larger library, ready to play Parking games and running PS4 titles

Which one should you actually buy?

  • You play two or three current games. Housekeeping, not hardware. Spend nothing.
  • You want a big library installed and instantly playable. An M.2 drive. It is the only option that adds space PS5 games run from.
  • You still have a large PS4 collection. A USB drive, and it is the cheaper answer as well as the right one.
  • Your broadband is slow or capped. A USB drive first. Copying back from a local drive beats re-downloading, every time.
  • You want both. Sensible and common: M.2 for what you are playing, USB for the rest.

If the budget stretches to one and you only play PS5 games, the M.2 is the upgrade. A USB drive is the better second purchase rather than the better first one — unless downloads, not space, are what is actually annoying you.

Fitting an M.2 drive without damaging anything

  • Switch the console off completely — not rest mode — and disconnect it as Sony’s guide describes for your model.
  • Touch a grounded metal object before you start. Sony warns that static electricity can damage the drive or the console.
  • You need a #1 Phillips or cross-head screwdriver. That is the whole tool list.
  • Keep the very small screws somewhere they cannot roll off the table.
  • Format the drive when the console prompts you, and do not cut the power mid-format. Formatting erases whatever is on the drive.

Decide which problem you have before you open a browser tab: no room for the games you are playing, or nowhere to keep the ones you are not. The first is an M.2 job, the second is a USB one, and on a fair number of consoles it is neither. If the drive you buy turns out to be the wrong height for the bay, delivery and returns covers sending it back. More PlayStation setup guides sit under setup tips.

Frequently asked questions

Can I play PS5 games from a USB hard drive?

No. Sony is explicit that PS5 games cannot be played directly from USB extended storage, so anything you park there has to be copied back to console storage or an M.2 SSD before it will launch. PS4 games are different and do run straight from a USB drive. Copying back still beats re-downloading, which is the real reason to keep one.

What M.2 SSD does Sony say the PS5 needs?

A PCI-Express Gen4 x4 M.2 NVMe SSD (Key M) between 250GB and 8TB, with a sequential read speed of 5,500MB/s or faster recommended. It must have a cooling structure such as a heatsink and heat transfer sheet, and it must fit the size limits set out in Sony’s M.2 SSD guide.

Do I lose my games if I delete them to free up space?

No. Deleting a game removes the installed data, not your right to it, so anything bought digitally can be re-downloaded from your library and disc games reinstall from the disc. Saved data is held separately from the install, so clearing a game does not remove your saves, and PlayStation Plus members can upload saves to cloud storage first.

Can I return an SSD if it turns out not to fit my PS5?

Usually, yes. Under the Consumer Contracts Regulations 2013 you have 14 days from delivery to cancel most online orders, including a drive you have unboxed to check the heatsink height. Handling it beyond what you could in a shop can reduce the refund, so measure before you install and format. Our delivery and returns page sets out the steps.

Prices, specifications and manufacturer support can change. Check the product listing and the manufacturer's own guidance before you buy, and ask our team if you're unsure.