Sec 1: Activity on Mass Storage Structure

What is the primary type of secondary storage for modern computers?

• Optical drives

• Hard disk drives (HDDs)

• Magnetic tapes

• Solid-state drives (SSDs)

What is the typical range of platters for hard disk drives?

• .85” to 14”

• 2” to 16”

• .5” to 10”

• 1” to 12”

What is the theoretical maximum transfer rate for hard disk drives mentioned in the text?

• 12 Gb/sec

• 6 Gb/sec

• 1 Gb/sec

• 3 Gb/sec

What is the average seek time for desktop hard disk drives?

• 10ms to 20ms

• 3ms to 12ms

• 1ms to 3ms

• 5ms to 15ms

What is a head crash?

• A failure in the power supply

• A software error

• A type of data corruption

• When the disk head contacts the disk surface

What is the lifespan of NAND flash memory typically measured in?

• Access time

• Drive writes per day (DWPD)

• Transfer rates

• Seek times

What is the average access time formula for hard disks?

• Transfer rate + seek time

• Average seek time + average latency

• Seek time + transfer time

• Latency + controller overhead

What is a characteristic of nonvolatile memory devices?

• They are less reliable than HDDs

• They have moving parts

• They are faster than HDDs

• They can overwrite data in place

What is the first commercial disk drive mentioned in the text?

• Seagate Barracuda

• Western Digital 1TB

• IBM RAMDAC

• IBM Model 350

What is the average I/O time for transferring a 4KB block on a 7200 RPM disk?

• 5.5ms

• 9.301ms

• 14.56ms

• 12ms