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Comparison Seagate BarraCuda 120 ZA500CM1A003 500 GB vs Seagate BarraCuda SSD STGS500401 500 GB

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Seagate BarraCuda 120 ZA500CM1A003 500 GB
Seagate BarraCuda SSD STGS500401 500 GB
Seagate BarraCuda 120 ZA500CM1A003 500 GBSeagate BarraCuda SSD STGS500401 500 GB
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Main
Best-in-class sequential read and write speed. Good IOPS. Metal case. Great rewrite resource. 5 years warranty. Useful proprietary software.
Placementinternalinternal
Size500 GB500 GB
Form factor2.5"2.5"
InterfaceSATA 3SATA 3
Technical specs
Memory type3D TLC NAND3D TLC NAND
Write speed540 MB/s535 MB/s
Read speed560 MB/s560 MB/s
Shockproof1500 G1500 G
MTBF1.8 m h1.8 m h
Write IOPS90 K90 K
Read IOPS90 K90 K
TBW300 TB249 TB
DWPD0.3 times/day0.3 times/day
Manufacturer's warranty5 years5 years
General
TRIM
Size100x70x7 mm100x70x7 mm
Weight50 g50 g
Added to E-Catalogmarch 2020july 2018

Write speed

The highest speed in write mode characterizes the speed with which the module can receive information from a connected computer (or other external device). This speed is limited both by the connection interface (see "Connector"), and by the characteristics of the device of the SSD itself.

TBW

The abbreviation TBW stands for drive time between failures, expressed in terabytes. In other words, this is the total amount of information that is guaranteed to be written (rewritten) to this module. This metric measures the overall reliability and lifespan of a drive—the higher the TBW, the longer the device will last, all other things being equal.

Note that knowing the TBW and the warranty period, you can calculate the number of rewrites per day (DWPD, see the relevant paragraph), if the manufacturer did not specify these data. To do this, use the formula: DWPD = TBW / (V * T * 365), where V is the drive capacity in terabytes, T is the warranty period (years). As for specific numbers, there are a lot of drives on the market with a relatively low TBW — up to 100 TB ; even these values are often sufficient for everyday use for a considerable amount of time. However, models with TBW at the level of 100 – 500 TB are more common. Values of 500 – 1000 TB can be classified as "above average", and in the most reliable solutions this figure is even higher.
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