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Comparison Hitachi Travelstar Z5K500 2.5" HTS545050A7E680 500 GB
SATA 3
vs Hitachi Travelstar Z7K500 2.5" HTS725050A7E630 500 GB

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Hitachi Travelstar Z5K500 2.5" HTS545050A7E680 500 GB SATA 3
Hitachi Travelstar Z7K500 2.5" HTS725050A7E630 500 GB
Hitachi Travelstar Z5K500 2.5" HTS545050A7E680 500 GB
SATA 3
Hitachi Travelstar Z7K500 2.5" HTS725050A7E630 500 GB
from £72.91 
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Placementbuilt-inbuilt-in
TypeHDDHDD
FeaturespCpC
Size500 GB500 GB
Form factor2.5 "2.5 "
ConnectionSATA3SATA3
Manufacturer's warranty3 years3 years
Technical specs
Cache memory8 MB32 MB
RPM5400 rpm7200 rpm
Average search time13 ms13 ms
Operation power consumption1.8 W1.8 W
Standby power consumption0.2 W0.2 W
Shockproof400 G400 G
Reading noise level24 dB
Standby mode noise level23 dB
MTBF600 K600 K
General
Size100x70x7 mm
Weight95 g
Added to E-Catalogmay 2014december 2012

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.

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.

Reading noise level

The level of noise produced by the disk when reading and/or writing information. The source of sound in this case is the moving plates of the disk, as well as the mechanics that control the reading heads. The lower the noise level, the more comfortable the use of the device. The maximum noise produced by modern hard drives during operation is about 50 dB — this is comparable to the sound background in an average office.

Standby mode noise level

The amount of noise produced by a disk "idle", when no read and/or write operations are performed. The sound source in this case is the plates — they rotate all the time while the disk is on; since no other mechanics are involved, idle noise is generally lower than read/write noise. The lower the noise level, the more comfortable the use of the device. The maximum noise level of modern hard drives in standby mode is about 40 dB — this is comparable to quiet human speech.
Hitachi Travelstar Z5K500 2.5" often compared
Hitachi Travelstar Z7K500 2.5" often compared