A review published on October 2, 2026, reports about 3,150 MB/s for both read and write speeds on the Mac mini M6’s 256GB SSD, and about 6,300 MB/s on the 512GB configuration. A separate Blackmagic Disk Speed Test comparison reports its own figures, with the 512GB model faster in both directions. The internal SSD is described as soldered, so capacity deserves attention before purchase.
NeoTeo’s earlier coverage of the Mac mini M6’s CPU and GPU performance and configuration limits looked at other parts of the system; SSD capacity adds another choice for prospective buyers.
The M6 Mac mini’s SSD speed difference
Read speed measures how quickly the drive can deliver data; write speed measures how quickly it can save it. In one reported Blackmagic Disk Speed Test comparison, the 512GB configuration posted higher read and write speeds than the 256GB version:
| Configuration | Read speed | Write speed |
| 256GB SSD | 3,216.8 MB/s | 3,000.2 MB/s |
| 512GB SSD | 6,371.5 MB/s | 6,577.4 MB/s |
The review published October 2 gave a separate, approximate set of results: about 3,150 MB/s for reads and writes on the 256GB configuration, compared with about 6,300 MB/s for both on the 512GB version.
Fixed internal storage makes capacity matter
The Mac mini M6’s internal SSD is reported to be soldered to the board, rather than fitted as a removable module. The reviewed base configuration pairs 16GB of unified memory with a 256GB SSD. Since the internal storage is not described as user-removable, choose the capacity you expect to need when configuring the computer.
An external SSD or hard drive can add storage. One Mac mini M4 owner reported that replacing a poorly made external-drive enclosure stopped crashes and drive-recognition problems.
