It is the total amount of storage space consumed on the disk. In Web Hosting, its the total amount of storage space you are using, HTML files, images, logs, etc.
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In standard binary usage for memory a KB is 1024 bytes. In standard decimal usage for disk drives a KB is 1000 bytes. Confused yet?
Disk Defragmenter
disk driver
No a disk drive is neither input or output device, it is an optical disk drive (for CD/DVD's) and a disk drive (for hard drives) would be a storage device.
The main difference between the C-SCAN and SCAN algorithms for disk scheduling is how they handle requests that are located at the end of the disk. C-SCAN moves the disk arm to the other end of the disk after servicing the last request, while SCAN moves the arm back to the beginning of the disk. This difference affects the order in which requests are serviced and can impact the overall efficiency of the disk scheduling algorithm.