[Howto] Understanding HDD's Model Naming Convention
Ever wondered why Hard drive model carry 10-14digit string, why not simple names. because model number of a hard drive can say lot of information about it e.g storage capacity,cache size & connector interface.storage companies use a set of conventions
Understanding a model no. would help you know about features of it by simply checking it label & you would no longer have to be dependent on not-so-informed salesman in your local shop. many times there are different model no. of exact same capacity but they differ in cache size which has a direct result on performance. more cache means faster performance
Now we will try to understand model number of various hard drives from different manufacturers.
Note: i would discuss only about consumer series internal hard drives from popular manufacturers. discussing others are beyond the scope of this guide.
Where do i find model no? Its written clearly on faceplate of hard drive with bold characters along the serial no and other information like date of manufacturing etc.
1)Seagate
sample model number:ST3500630AS we break is as: ST-3-500-6-30-AS
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ST: Company initials. ST= “Seagate Technology”, STM - Seagate Technology Maxtor(Maxtor Hard drive).
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3: Form factor. 3 = Standard 3.5” inch drives; 9 = 2.5” inch Laptop drive.
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500: Total Capacity in Gigabytes(1000mb = 1GB). this is a 500GB model.
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6:Cache Size. 0 = 2MB, 2 = 2MB, 3 = 8MB,4 = 16MB, 6 = 16MB and 8 = 8MB. Note:the cache is the buffer memory between the controller and the mechanical hdd. the more cache it has - the more data it can store to transmit off to the controller. the faster data access on the hdd will be.please don’t confuse it with CPU Cache.
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AS: Connector Interface type, A= 40pin PATA or IDE and AS=SATA interface.
Link:How to interpret Seagate model numbers
2) Western Digital
sample model number::WD6400AAKS
we break it as: WD-640-0-A-A-K-S
WD:Company initials
640: drive capacity in Gigabytes. its a 640GB drive
A:Form factor.
A:Brand/Series
K:RPM/Buffer Size or Attribute S:Interface Type