Hard Drive WD Red Pro 18TB:The WD Red Pro 18TB hard drive is one of the high load internal HDDs for NAS and ordinary data centres. 3.5 HDDs are designed mainly for desktop PCs and data centres. One of the key parameters is obviously the rotational speed. The 7200 RPM RPM ensures better system response across the board. The overall data capacity of the HDD is 18000 GB. The storage has a 512 MB memory cache. The data transfer between the Western Digital hard disk and other hardware is facilitated through the SATA III interface. WD Red Pro 18TB HDD Key Features Read speed up to 272 MB/s and write speed up to 272 MB/s 512 MB memory cache Western Digital 3.5 disk for ordinary drive bays Standard power consumption is 6,1 W, while in stand-by mode it makes 0.9 W You can connect it to a PC or other devices via the SATA III interface Although standard HDDs are a tad more fragile due to their mechanical parts, but they are also more affordable than the newer SSDs Other Hard Disk Features Platter HDDs have a special construction. The enclosure conceals a mechanism that utilises moving platters accompanied by hard disk heads that facilitate reading and writing of data. These moving parts are not particularly resistant against shock or impact, but on the upside, this design also delivers its amazing price/capacity ratio. The important parameter that affects the speed of a HDD is the number of platter revolutions per minute, generally known as RPM. In case of the WD Red Pro 18TB, you can look forward to 7200 RPM RPM. This is ideal for demanding users, such as graphic or video editors - in short, people who work with large amounts of data. File access speed and overall stability is also significantly affected by the disk buffer, usually called cache. The Western Digital hard disk is equipped with a 512 MB cache that keeps the last written data for their prompt retrieval and reading. Connecting the Western Digital Hard Disk In order to mount the WD Red Pro 18TB in your laptop or other device, it requires a 3.5 slot. The communication between the HDD and PC happens using the SATA III interface with a speed of 3 Gbit/s. The technology is one of the most popular HDD data transfer options available and delivers a speed of 600 MB/s.