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3.5-Inch Internal Hard Drives for Desktops, NAS

SATA and SAS 3.5-inch hard drives for desktops, NAS units, servers and recording systems, from everyday disks to high-capacity models. 4,938 products from $0.82 to $13,618.99. DELL, Seagate, Western Digital and more.

4,938 products from $0.82

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Workload rating: desktop, NAS, surveillance or enterprise

The intended-use line matters more than the badge on the label. Desktop drives are designed for office-hours use. NAS drives are tuned for 24/7 operation in multi-bay enclosures, with vibration tolerance and short error-recovery timing so RAID arrays do not drop them. Surveillance drives favour constant writing from many camera streams. Enterprise drives add higher workload ratings and SAS options for servers. Using a drive outside its intended use usually works, but you give up the design margin.

Also check how the drive records data. Conventional recording (CMR) writes each track separately, while shingled recording (SMR) overlaps tracks to fit more data. SMR suits archives and backups but can slow badly under sustained random writes, which is when a RAID array rebuilds or a NAS fills. Manufacturers do not always put the recording method in the title, so check the datasheet for the exact model before choosing a drive for an array.

Interface, rotation speed and cache

Current desktops use SATA 6 Gb/s. SAS drives, at 6 or 12 Gb/s, need a SAS controller and will not connect to a SATA port, and IDE drives (Ultra ATA100) only suit very old machines. Rotation speed trades noise and heat for responsiveness: 5,400 or 5,900 RPM runs cool and quiet, 7,200 RPM is the common balance, and 10,000 or 15,000 RPM drives are enterprise SAS models. The 4.16 ms latency figure on 7,200 RPM drives is half a turn of the platter. Cache from 64 to 512 MB helps modestly; capacity above 2 TB needs a GPT partition.

Questions about 3.5-Inch Internal Hard Drives for Desktops, NAS

Can I use a desktop hard drive in a NAS?
It often works, but desktop drives are not designed for round-the-clock use, drive-to-drive vibration or the error-recovery timing RAID uses. NAS-rated drives are the safer match for an always-on array.
What is the difference between CMR and SMR?
CMR writes each track separately; SMR overlaps tracks like roof shingles to pack more data. SMR is fine for archives and backups, but can slow under sustained writes such as a RAID rebuild. Check the datasheet.
Will a SAS drive work in my SATA port?
No. SAS drives need a SAS controller or host bus adapter. SATA drives work on SAS controllers, but not the other way round, so check what your controller or backplane supports before choosing.