Making room for GTA 6 on PS5 starts with one distinction: free space on a USB drive is not the same as space you can play from. PS5 games run from console storage or a compatible internal M.2 SSD. USB extended storage holds game files for later. Check which job you need the drive to do before buying one.

Which storage does what?
LocationPlay PS5 gamesMain use
Console storage Yes Install and play
Compatible internal M.2 SSD Yes Expand playable storage
USB extended storage No Move games out of internal storage

Source · www.playstation.comPlayStation — USB storage rules

Check the space you already have

Open Settings → Storage on PS5. If you need room, start with large installations you no longer use under Games and Apps. Removing an installation is a different operation from deleting progress under Saved Data, so check the menu name. Purchased games can be downloaded again from your library.

Source · www.playstation.comPlayStation — manage storage and saved data

A seaplane above islands and a long bridge.
GTA VI promotional screenshot. © Rockstar Games / Take-Two Interactive
Source / rights
Image / usage information: © Rockstar Games / Take-Two Interactive · Image source ↗

What to check before buying an M.2 SSD

Sony specifies PCIe Gen4x4 M.2 NVMe; M.2 SATA is unsupported. Effective cooling is required, and sequential reads of at least 5,500 MB/s are recommended. Check the dimensions including the heatsink. These are PS5 compatibility requirements, not a measured GTA VI loading-time or frame-rate improvement.

Source · www.playstation.comM.2 requirements and model-specific installation

How many GB should you reserve for GTA 6?

Rockstar and PlayStation have not published an exact installed size. Do not choose storage capacity around a rumoured GB figure. When the download becomes available, use the requirement shown on your PS5 and distinguish the download amount from installed files.

Source · www.playstation.comOfficial GTA VI product information