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Comparison WD Purple Surveillance WD22PURZ 2 TB
256 MB
vs WD Blue WD20EZBX 2 TB
256/7200

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WD Purple Surveillance WD22PURZ 2 TB 256 MB
WD Blue WD20EZBX 2 TB 256/7200
WD Purple Surveillance WD22PURZ 2 TB
256 MB
WD Blue WD20EZBX 2 TB
256/7200
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Placementbuilt-inbuilt-in
TypeHDDHDD
FeaturespCpC
Size2000 GB2000 GB
Form factor3.5 "3.5 "
ConnectionSATA3SATA3
Manufacturer's warranty3 years2 years
Technical specs
Cache memory256 MB256 MB
Record technologySMR
RPM5400 rpm7200 rpm
Data transfer rate215 MB/s
General
Size147x102x26 mm147x102x26 mm
Added to E-Catalogmay 2022may 2021

Manufacturer's warranty

Manufacturer's warranty provided for this model.

In fact, this is the minimum service life promised by the manufacturer, subject to the rules of operation. Most often, the actual service life of the device is much longer than the guaranteed one.

Record technology

CMR(Conventional Magnetic Recording) is a classic method of magnetic recording, characterized by high data access speed. CMR hard drives are used in systems where it is important to provide high (as far as possible) data read/write speed. These are user computers, security video surveillance systems, etc. The main disadvantage of CMR hard drives is the high complexity of creating volume drives, which is reflected in their price. Additionally, HDDs with CMR technology are quite “gluttonous” in terms of power supply.

SMR(Shingled Magnetic Recording) — a promising technology for magnetic recording, which is called "tiled". SMR allows to achieve high data density, which in turn increases the capacity of memory drives and lowers their market value. SMR hard drives have slow rewriting speed, which makes such memory drives poorly suited for use in client computer systems. But they have proven themselves well when working as part of data processing centers, archives and similar systems for which low write / rewrite speed is not critical. However, some companies still produce SMR solutions for personal and even mobile systems. These HDDs use an optimized write/rewrite technology called Drive-Managed SMR (DM-SMR).

RPM

For drives used in a PC (see "Intended use"), 5400 rpm(normal) and 7200 rpm(high) are considered standard speeds. There are also more specific options, including models with the ability to adjust the speed depending on the load. In server HDDs, in turn, higher speeds can be used — 10,000 rpm and even 15,000 rpm.

Data transfer rate

The speed of data transfer between the disk and client devices is determined by the type of drive, spindle speed, memory buffer size and connection connectors. The last parameter is the most important, since it is impossible to exceed the bandwidth of a particular interface.
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