HDD (Hard Disk Drives)

HDD (Hard Disk Drives)

1. One of the most common storage methods.

   • Very slow.
     • Has trouble with latency.
       • Latency is the time it takes for a specific block of data on a data track to rotate around the read-write head.
       • Messages such as "please wait" or "not responding" are examples of this.

2. Stores data in a digital format on magnetic surfaces of disks.

   • Data is stored on the surface in sectors and tracks
   • Disks are also known as platters.
     • Platters can store data on both sides.
   • Disks can spin about 7000 times a second.
     • A number of read-write heads can access all of the surfaces in the disk drive
       • These read-write heads can move from the center of the disk to the edge of the disk (and back) 50 times a second.