SAS vs SATA drives
SAS and SATA are two drive interfaces. SAS-3 runs at 12 Gbps with dual ports, full-duplex signaling, and better error handling for enterprise arrays; SATA III runs at 6 Gbps, single port, half-duplex, and costs less per gigabyte.
SATA drives use a single data path and are fine for bulk capacity, backups, and low-duty workloads. SAS drives add a second port for multipath redundancy, so a controller can reach the drive through two independent routes. SAS also supports longer cable runs, more devices per expander, and richer error reporting through the SCSI command set.
A practical rule: SATA connects to SAS controllers, but SAS drives do not connect to SATA-only ports. That backward compatibility lets one SAS backplane hold a mix of SAS and SATA drives, which many servers use to blend fast SAS or NVMe with cheap SATA capacity.
For a China purchase, decide by workload before the seller decides for you. Databases and 24/7 arrays justify SAS or NVMe; cold storage and media archives run fine on SATA. Check whether the RAID controller and expander support 12 Gbps SAS-3, since some budget refurb boxes ship with older 6 Gbps SAS-2 parts.
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