Exam 6: External Memory

A bit near the center of a rotating disk travels past a fixed point slower than a bit on the outside.

SSD performance has a tendency to speed up as the device is used.

Because data are striped in very small strips,RAID 3 cannot achieve very high data transfer rates.

Scanning information at the same rate by rotating the disk at a fixed speed is known as the _________.

A removable disk can be removed and replaced with another disk.

There are typically hundreds of sectors per track and they may be either fixed or variable lengths.

__________ is the standardized scheme for multiple-disk database design.

The disadvantage of _________ is that the amount of data that can be stored on the long outer tracks is only the same as what can be stored on the short inner tracks.

RAID levels 4 through 6 make use of an __________ access technique that allows separate I / O requests to be satisfied in parallel.

In most contemporary systems fixed-length sectors are used,with _________ bytes being the nearly universal sector size.

The set of all the tracks in the same relative position on the platter is referred to as a _________.

A __________ disk is permanently mounted in the disk drive,such as the hard disk in a personal computer.

RAID level ________ has the highest disk overhead of all RAID types.

A _________ drive is a memory device made with solid-state components that can be used as a replacement to a hard disk drive.

Data is organized on the platter in a concentric set of rings called ________.

Adjacent tracks are separated by _________.

Magnetic disks are the foundation of external memory on virtually all computer systems.

Data are recorded on and later retrieved from the disk via a conducting coil named the _________.

The _________ disk is a small,flexible platter and the least expensive type of disk.

A _________ is a high-definition video disk that can store 25 Gbytes on a single layer on a single side.