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Comparison WD Black WD4004FZWX 4 TB
cache 128 MB
vs WD Caviar Black WD4001FAEX 4 TB

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WD Black WD4004FZWX 4 TB cache 128 MB
WD Caviar Black WD4001FAEX 4 TB
WD Black WD4004FZWX 4 TB
cache 128 MB
WD Caviar Black WD4001FAEX 4 TB
from $241.10 up to $272.60
Outdated Product
from $353.00
Outdated Product
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Placementbuilt-inbuilt-in
TypeHDDHDD
FeaturespCpC
Size4000 GB4000 GB
Form factor3.5 "3.5 "
ConnectionSATA3SATA3
Manufacturer's warranty5 years5 years
Technical specs
Cache memory128 MB64 MB
RPM7200 rpm7200 rpm
Average search time4 ms4 ms
Operation power consumption10 W10 W
Standby power consumption1 W1 W
Shockproof30 G30 G
Reading noise level34 dB34 dB
Standby mode noise level29 dB29 dB
MTBF300 K300 K
General
Weight780 g780 g
Added to E-Catalogaugust 2016february 2013

Cache memory

The amount of internal hard drive memory. This memory is an intermediate link between the high-speed computer RAM and the relatively slow mechanics responsible for reading and writing information on disk platters. In particular, the buffer is used to store the most frequently requested data from the disk — thus, the access time to them is reduced.
Technically, the size of the buffer affects the speed of the hard drive — the larger the buffer, the faster the drive. However, this influence is rather insignificant, and at the level of human perception, a significant difference in performance is noticeable only when the buffer size of the two drives differs many times — for example, 8 MB and 64 MB.
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