SSD Vs HDD and meaning of WD Hard drive color difference

by Abhijeet Kumar

SSD and hard disk drives are similar but they store data very differently. There are advantages and disadvantages to each type of drive, and deciding on which type is right for you. This post shows you how each type of storage drive works and what does it means.

HDDs works on spinning disks, or platters, to read and write data. It consist of one or more magnetically-sensitive platters, an actuator arm with a read/write head on it for each platter, and a motor to spin the platters and move the arms. There is also an I/O controller and firmware that tells the hardware what to do and communicates with the rest of the system. The platters of HDD spin at the speeds of (4200 rpm to 7200 rpm) for consumer computers. These speeds are correlate to read / write rates. The higher the spin speed, that much faster a hard drive would read and write data.

Blue HDD is suitable for home usage, low cost advantages with 7200 rpm, running noise is a bit higher than Green HDD, performance is lower than Black HDD.

Green HDD produces low noise, suitable for home usage, suitable for file downloading, it generates lower heat, more eco-friendly. Energy-friendly HDD, large capacity storage; adopting IntelliPower technology, the speed can automatically adjust between 5400-7200 rpm. Cons: low performance, high-delay time, average life expectancy.

Red HDD: Specifically designed for NAS environment that requiring 7days 24 hours continuous working. Western Digital Red HDD are mainly used in 1 to 5 HDDs small and medium scale NAS residential and small enterprise users. Red HDD’s performance is close to the Green HDD, power consumption is low, low noise, can be suitable for continuous working, featuring NASware technology, this technology offers better compatibility, can fit NAS or RAID seamlessly.

Purple HDD: Green HDD AV-GP’s replicate, support ignore cyclic redundancy check (CRC) errors, suitable for video surveillance storage, 24*7 continuous working design.

Additionally, there are Enterprise grade HDDs offer the maximum performance, super large cache, high-speed. Enterprise grade HDDs also has the 7*24 hours continuous working capability, compared with traditional HDDs, offering high reliability and long life expectancy, also the highest Mean Time Before Failure (MTBF) are main differences.

In conclusion, Green and Blue HDDs are suitable for desktop PC, generally the Blue HDD’s read/write speed is faster than Green HDD, so many users choose the Blue HDDs for their PCs, while Black HDDs are widely used in servers. The Red HDD is specifically designed for the NAS, Purple HDDs are suitable for video surveillance system, can support up to 32-channel HD security cameras.

Black HDD: High performance, large cache, high-speed. Lias: LS WD Caviar Black. Mainly suitable for enterprise applications that requiring high-end computing such as video/photo editing/rendering and high performance game console, or servers.


Solid state drives(SSD) uses flash memory to deliver superior performance. There are lots of moving parts inside your hard drive (HDD) like magnetic heads, spindles, and spinning platters, which takes some time for movement. So it's very hard to work faster than SSD. Without moving parts inside SSDs, it's more faster, durable and works cooler and use less energy. Solid state drives deliver faster load times for games, applications, and movies.