From the online documentation:
M.2 You can use M.2 2280-sized NVMe SSDs. We have drives from 250GB up to 4TB available in the Framework Marketplace, and drives ranging from 128GB to 8TB are available in the market. While drives from other brands should work, we’ve focused our compatibility testing on the following ones:
- WD_BLACK™ SN750 NVMe™ SSD 250GB
- WD_BLACK™ SN750 NVMe™ SSD 500GB
- WD_BLACK™ SN750 NVMe™ SSD 1TB
- WD_BLACK™ SN750 NVMe™ SSD 2TB
- WD_BLACK™ SN750 NVMe™ SSD 4TB
- WD_BLACK™ SN850 NVMe™ SSD 500GB
- WD_BLACK™ SN850 NVMe™ SSD 1TB
- WD_BLACK™ SN850 NVMe™ SSD 2TB
- Western Digital SDBPNTY-256G
- Western Digital SDBPNTY-512G
- Western Digital SDBPNTY-1T00
- Kioxia KXG6AZNV256G
- Kioxia KXG6AZNV512G
- Kioxia KXG6AZNV1T02
- Kioxia KXG6APNV2T04
Note that SATA M.2 drives will not work on the Framework Laptop with 11th Gen Intel Core Processors. You will need to use an NVMe drive, which we would recommend anyway due to the significant performance improvements that brings.