*Initially introduced by WD, and temporarly used by Seagate as well, it is now commonly used to refer to drive’s performance and target use. HDDs colour-coding define HDDs’ use and level of performance.
Colour-coding and usual characteristics:
Blue: made for regular use, 7200rpm, 2yrs warranty.
Green: quiet and slower drives, for storage/external use, 5400-5900rpm, 2ys warranty.
Black: high performance drives, 7200rpm, 5yrs warranty.
Red: for NAS/RAID environments, 5400-7200rpm, 3yrs warranty.
Purple: for surveillance systems, 5400rpm, 3yrs warranty