External Memory

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

• nonremovable

• movable-head

• double sided

• removable

Greater ability to withstand shock and damage, improvement in the uniformity of the magnet film surface to increase disk reliability, and a significant reduction in overall surface defects to help reduce read-write errors, are all benefits of ___________.

• magnetic read and write mechanisms

• platters

• the glass substrate

• a solid state drive

Data are transferred to and from the disk in __________.

• tracks

• gaps

• sectors

• pits

The sum of the seek time and the rotational delay equals the _________, which is the time it takes to get into position to read or write.

• access time

• gap time

• transfer time

• constant angular velocity

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

• RAID

• CAV

• CLV

• SSD

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

• 0

• 1

• 3

• 5

What is the main purpose of RAID technology?

• To increase the storage capacity of a single disk.

• To combine multiple disk drives into a single logical unit for improved performance or data protection

• To store data in a centralized database

• To encrypt data on disk drives

Which of the following is a disadvantage of RAID 1?

• No redundancy

• Requires at least four disks

• Higher cost due to duplication of data

• Slower performance

Which RAID level requires at least four disks and provides both high performance and high redundancy?

• RAID 0

• RAID 1

• RAID 5

• RAID 10

Which of the following is true about the durability of SSDs compared to HDDs?

•  SSDs are more susceptible to physical shock and vibration.

• SSDs have a longer lifespan due to the lack of mechanical components.

• HDDs are less durable in extreme conditions than SSDs.

• SSDs have a higher risk of mechanical failure due to wear and tear.