WD 500GB Desktop Computer 3.5 INCH Internal Mechanical Hard Drive SATA 250 320 500GB 1 2 3 4TB 6Gbs Hard Drive for Desktop

Main Features

Capacity: 250/320/500/1000/2000/3000/4000GB （used）
Interface: SATA 3Gb/s-6Gb / s
Dimensions: 3.5 inches
RPM rating: 5400RPM-7200RPM
CACHE:16M-64MB
Size: 26.1 * 147 * 101.6

Applicable models: surveillance video recorder / desktop computer
Silent home high-speed hard disk monitoring requires home recording and video recorder universal support 7X24 hours per day
SATA universal interface, support all desktop SATA serial interface serial port

On a computer 1GB = 1024MB, the hard drive manufacturer usually converts by 1GB = 1000MB. Take a 120GB hard drive as an example:
Vendor capacity calculation method: 120GB = 120,000MB = 120,000,000KB = 120,000,000,000 bytes
Convert to operating system. Calculation method: 120,000,000,000 bytes / 1024 = 117,187,500KB / 1024 = 114,440.9MB = 111.8GB.