![Acasis 2.5\](https://i2.wp.com/ae01.alicdn.com/kf/HTB1KQqeSVXXXXX6apXXq6xXFXXXm/Acasis-2-5-Portable-External-Hard-Drive-250G-USB3-0-Hard-Disk-Storage-Devices-High-Speed.jpg?w=800&resize=800,800&ssl=1 "Acasis 2.5\")
![Acasis 2.5\](https://i2.wp.com/ae01.alicdn.com/kf/HTB1KQqeSVXXXXX6apXXq6xXFXXXm/Acasis-2-5-Portable-External-Hard-Drive-250G-USB3-0-Hard-Disk-Storage-Devices-High-Speed.jpg?w=1200&resize=1200,0&ssl=1 "Acasis 2.5\")
Price: 19.80
250GB External Hard Drive USB3.0 Hard Disk Storage Devices High Speed 2.5'HDD Desktop Laptop Hd Externo
Support system:
98SE, ME, 2000, XP, Vista, WIN7,WIN8
Specifications:
Hard Drive Type:2.5" HDD
USB Interface:USB 3.0
Capacity:250GB
Disk Rotational Speed:5400rpm
Disk Cache Size:8MB
3 Years Warranty
Package includes:
1* USB 3.0 External Hard Drives 250GB
1* USB cable
Hard disk vendors are using decimal arithmetic: 1MB = 1000KB, 1G = 1000MB calculated
Our computers and card readers use the binary system for size calculation and here is where the missing bytes are .
That is : 1MB=1024KB, 1GB=1024MB
40 GB=about 37GB
60 GB=about 55GB
80GB=about 74GB
120GB=about 111GB
160GB=about 149GB
250GB=about 232GB
320GB=about 298GB
500GB=about 465GB
640GB=about 595GB
1TB=about 930GB
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