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Comparison WD Red Plus WD40EFPX 4 TB
256/5400
vs WD Purple Surveillance WD42PURZ 4 TB
42PURZ

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WD Red Plus WD40EFPX 4 TB 256/5400
WD Purple Surveillance WD42PURZ 4 TB 42PURZ
WD Red Plus WD40EFPX 4 TB
256/5400
WD Purple Surveillance WD42PURZ 4 TB
42PURZ
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Placementbuilt-inbuilt-in
TypeHDDHDD
FeaturesserverpC
Size4000 GB4000 GB
Form factor3.5 "3.5 "
ConnectionSATA3SATA3
Manufacturer's warranty3 years3 years
Technical specs
Cache memory256 MB256 MB
Record technologyCMRCMR
RPM5400 rpm5400 rpm
Data transfer rate175 MB/s
MTBF1 M h1 M h
MTBF300 K
General
Size147x102x26 mm147x102x26 mm
Weight570 g
Color
Added to E-Catalogdecember 2022may 2022

Features

The general purpose of a hard drive is the type of devices for which it was originally intended.

For PC. Hard drives designed for use with conventional consumer computers and laptops. At the same time, the possibility of installing an internal HDD (see "Performance") directly depends on the form factor (see the relevant paragraph), while external models are not subject to such restrictions — it is enough for them to have the appropriate connection connector. Also note that almost all external hard drives are designed specifically for PCs; making server models external is not technically justified.

For the server. Hard drives designed for servers have increased speed and reliability, because they constantly have to receive and give large amounts of information. To ensure speed, they may provide an increased rotation speed (up to 15,000 rpm). Such drives are made only internal (see "Performance"), and, in addition to SATA, they can use other, more specific connection methods — for example, SAS(see "Connection interfaces").

For game console. Specialized hard drives designed for use with game consoles. They are made only external (see "Performance"), they are intended mainly for storing games — including saves and user settings profiles. The main difference between such devices and classic external HDDs is...precisely the optimization for working with game consoles, including the availability of special software tools for improved integration. Many of these drives are originally designed for a specific model or family of set-top boxes.

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.

MTBF

Guaranteed (minimum) number of hard drive on-off cycles after which it will remain operational. The higher this number, the more reliable the drive.
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