An Alternative Definition for IQR. In some texts, the interquartile range is defined differently. It is defined as the difference between the largest and smallest values in the middle 50% of a set of data. To compute an interquartile range using this definition, first remove observations from the lower quartile.
A hard drive is a device used to store data in a semipermanent state on your computer. Computer memory is a series of small packets of data called bits. Each bit is a 1 or a 0, and each bit is stored as a small magnetic charge on the hard drive. A read/write head moves over the hard drive to retrieve or rewrite the bits as needed.
countable noun. 1  A computer's hard drive is its hard disk, or the part that contains the hard disk. ( 2 on a computer) the mechanism that handles the reading, writing, and storage of data on the hard disk. 3  a computer drive for hard disks, often, specif., such a drive as distinguished from a floppy-disk drive in the same computer.