Areal Density
Storage
Refers to the amount of data that can be stored in a givenamount of hard disk platter. Since disk platters surfaces aretwo-dimensional, areal density is a measure of the number ofbits that can be stored in a unit of area. It is usually expressedin bits per square inch (BPSI). Sometimes it is referred to asbit density. Higher areas of density under the rightcircumstances can improve the disks transfer rate.
Important indicator of the performance of the disk and drive that corresponds to the number of magnetic bits per unit area