Sony has confirmed that PS5 games will not be playable from all external hard drives. The company revealed more information about the PS5's storage in a new video today, where it also confirmed the console's specs.

A report by Digital Foundry reveals that while NVMe PC drives will work with the PS5, those that are being sold now are slower than the PS5's SSD. Sony will have to check these drives to make sure that they will work properly with the PS5, though it's unclear when fans will be able to buy them.

RELATED: PS5 Reveal, PlayStation 5 Trending on Twitter, but Not Why You Think

In comparison, the Xbox Series X uses SSD cards that can slot into the back of the console. The cards look okay, but it seems that they are the only option for Xbox Series X players who want to get more storage space in the console and without an external drive. The PS5 may not have that problem if it supports SSDs not sold by Sony, but players may have to wait longer for them.

Mark Cerny at podium

Another issue is that only some games can be played from external hard drives. The PS5 is backward compatible with some PS4 games, though the PS4 allows games to be installed and played from an external hard drive. Fans can store PS5 games on an external hard drive, but not play them. This likely means that anyone who has filled up their PS5's SSD may have to move games around to play them.

This may not be a huge issue, as one of the PS5's specs enable it to move around data very quickly. The console may have fewer teraflops than the Xbox Series X, but developers think that this SSD speed could be more important. The PS5 will also be able to load large games quickly, so it probably won't be difficult to move games from an external hard drive.

Gamers may be surprised with storage being one of the main reasons to buy a PS5 or an Xbox Series X. Microsoft has revealed how the Xbox Series X Quick Resume feature uses its SSD, while the PS5 will offer huge games without loading screens. Price and games will be important, but it seems that Sony and Microsoft also want fans to think about storage.

The PS5 remains planned for release in Holiday 2020.

MORE: 5 Weird Facts About the PlayStation 2 in Honor of Its 20th Anniversary

Source: Digital Foundry, Gamespot