Today, there are only three left in the field of mechanical hard disk: Seagate, SISU and Toshiba. After Western Digital admitted that SMR (laminated magnetic recording) was used for some NAS red disks, Toshiba and Seagate also confirmed that similar phenomena existed in their desktop consumer products. Toshiba simply lists the main models as CMR (traditional magnetic record, basically equivalent to vertical magnetic record) or SMR for consumers' judgment——
-Model md07aca: 7200 rpm, 12tb, 14tb are CMR (related products are mainly X300 Series)
-Model md04: 7200 rpm, 2, 4, 5, 6GB are CMR (related products are mainly X300 Series)
-Model DT02: 5400 rpm, 4 and 6tb are SMR (related products are mainly P300 Series)
-Model DT01: 7200 rpm, 500GB, 1, 2, 3TB are CMR (related products are mainly P300 Series)
SMR, while effectively improving the hard disk capacity, but in long or intensive write when the speed is obvious, for configuration NAS RAID is also easy to report errors, so it has been criticized, even become a street rat, everyone shouted.