Hard Drive WD Red Plus 4TB:The WD Red Plus 4TB hard drive is one of the high load internal HDDs for NAS systems. The 3.5 format is designed chiefly for desktop computers and data centres. One of the main characteristics is obviously the rotational speed (RPM). The 5400 RPM RPM should meet the needs of most typical users. You can look forward to a total data capacity of 4000 GB. The drive has a 128 MB memory cache. All the data communication between the Western Digital hard drive and a computer or other device takes place via the SATA III interface. WD Red Plus 4TB Hard Drive Key Features Read speed up to 175 MB/s and write speed up to 175 MB/s 128 MB memory cache Western Digital 3.5 disk fits into classic larger bays Typically, the power consumption of the hard drive is 4,8 W, while in stand-by mode it makes 0.4 W It communicates with a PC or other devices using the SATA III interface HDDs dont have much resistance against physical shocks, but they are also more affordable than the newer SSDs Other Hard Disk Features Standard HDDs are notable for their construction. Inside the enclosure there is a mechanism with moving platters, complete with disk read/write heads. These moving parts can be damaged by a shock or impact, but on the upside, this design also delivers a great combo of a low price and great storage capacity. The crucial parameter that affects the speed of a hard drive is the number of platter revolutions per minute, generally known as RPM. In case of the WD Red Plus 4TB, you can look forward to 5400 RPM RPM. This is a popular option for ordinary home computers and other devices that do not require high performance. System responsivity and stability is also impacted by the disk buffer - the so-called cache. The Western Digital platter drive features a 128 MB cache that stores the last used data for their fast retrieval and reading. Connecting the Western Digital Hard Drive In order to mount the WD Red Plus 4TB in your PC or other device, you need a 3.5 slot. The communication between the HDD and PC is done via the SATA III interface with a speed of 3 Gbit/s. This technology is one of the best HDD data transfer options available and delivers a speed of 600 MB/s.