July 2015 Archive


Disk Formatting
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Disk Formatting

A hard disk is made of a stack of aluminum, alloy, or glass platters 5.25 inch or 3.5 inch in diameter (or even smaller on notebook computers). On each platter is deposited a thin magnetizable metal oxide. After manufacturing, there is no information whatsoever on the disk.

Disk Arm Scheduling Algorithms
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Disk Arm Scheduling Algorithms

Now we will consider some issues related to disk drivers in general. First, look at how long it takes to read or write a disk block. The time needed is determined by three factors:For most disks, the seek time dominates the other two times, so reducing the mean seek time can improve system performance considerably.

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