Manufacturer: WESTERN DIGITAL
3.5 WD Purple (WD121PURZ) SATA 256 Cache/Buffer
|Advanced Format (AF)||Yes|
|Cameras supported||Up to 64|
|Drive Bays Supported||16+|
|Firmware Feature Name||AllFrame Al|
|Tarnish resistant components||Yes|
|Interface transfer rate (max)5 Buffer to host
Host to/from drive (sustained)
|Performance Class||7200 RPM|
|Load/unload cycles7||300 000|
|Annualized workload rating8||360TB/yr|
|Non-recoverable read errors per bits read||<1 in 1015|
|MTBF||1 500 000|
|Limited warranty (years)9||3|
|Average power requirements (W) Read/Write
Standby and Sleep
|Temperature (°C, on the base casting)|
|Operating12 Non-operating||0 to 65
-40 to 70
Operating (2 ms, read/write) Operating (2 ms, read)
Non-operating (2 ms)
|Acoustics (dBA)13 Idle
|Height (in./mm, max)||1.028/26.1|
|Length (in./mm, max)||5.787/147|
|Width (in./mm, ± .01 in.)||4/101.6|
|Weight (lb/kg, ± 10%)||1.46/0.66|
¹ Up to 1.5M MTBF for 8TB, 10TB, and 12TB capacities (up to 1.0M MTBF for lower capacities). MTBF specifications are based upon internal testing using a 40°C base casting temperature. MTBF
is based on a sample population and is estimated by statistical measurements and acceleration algorithms. MTBF does not predict an individual drive’s reliability and does not constitute a warranty.
² For capacities 4TB and higher.
³ As of April 2018
4 Not all products may be available in all regions of the world.5 As used for storage capacity, one gigabyte (GB) = one billion bytes and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte per second (MB/s)
= one million bytes per second, and gigabit per second (Gb/s)
= one billion bits per second. Effective maximum SATA 6 Gb/s transfer rate calculated according to the Serial ATA specification published by the SATA-IO organization as of the date of this specification sheet. Visit www.sata-io.org for details.
6 WD hard drive products manufactured and sold worldwide after June 8, 2011, meet or exceed Restriction of Hazardous Substances (RoHS) compliance requirements as mandated by the RoHS Directive 2011/65/EU.7 Controlled unload at ambient condition.
8 Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred x (8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations.
9 See http://support.wdc.com/warranty for regional specific warranty details.
10 Power measurements at room-ambient temperature.
11 No non-recoverable errors during operating tests or after non- operating tests.
12 On the base casting.
13 Sound power level.