Mac mini M6 benchmarks: 512 GB SSD doubles 256 GB speeds

Benchmarks show the 512 GB SSD in the Mac mini M6 outperforms the 256 GB version, with internal storage described as soldered. Published October 2, 2026, tests report approximate speeds of 3,150 MB/s for 256 GB and 6,300 MB/s for 512 GB. A September 23 comparison recorded 3,216.8 MB/s read and 3,000.2 MB/s write for 256 GB, versus 6,371.5 MB/s and 6,577.4 MB/s for 512 GB. Because the SSD is soldered to the motherboard, capacity must be chosen at purchase. External SSDs or hard drives can add space but cannot alter the internal configuration.