C191 MODULE 3 EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026/2027
What is the most common secondary storage? - Answers Magnetic disks
Transfer rate - Answers The rate at which data flow between drive and computer
Positioning time (random-access time) - Answers Time to move disk arm to desired cylinder
(seek time) and time for desired sector to rotate under the disk head (rotational latency)
Head crash - Answers Results from disk head making contact with the disk
surface (it's bad)
I/O busses - Answers EIDE, ATA, SATA, USB, Fibre Channel,
SCSI, SAS, Firewire
Host controller - Answers Uses bus to talk to disk controller built
into drive or storage array
Seek time is equal to what? - Answers Seek distance
Bandwidth - Answers Is the total number of bytes transferred, divided by the total time
between the first request for service
and the completion of the last transfer
SSTF - Answers Shortest seek time first, is a form of SJF but may cause starvation of some
requests.
Storage area networks (SANs) - Answers Network in which many hosts attach to
many storage units
Network-attached storage (NAS) - Answers A storage made available over a network rather than
over a local connection (such as a bus)
RAID 0 - Answers Striped parity no mirror minimum 2 disks
RAID 1 - Answers Mirroring minimum 2 disks
RAID 0+1/ RAID 1+0 - Answers Striped mirroring minumum 4 disks high reliability
RAID 3,4,5 - Answers Block interleaved parity much less redundancy
What is the most common secondary storage? - Answers Magnetic disks
Transfer rate - Answers The rate at which data flow between drive and computer
Positioning time (random-access time) - Answers Time to move disk arm to desired cylinder
(seek time) and time for desired sector to rotate under the disk head (rotational latency)
Head crash - Answers Results from disk head making contact with the disk
surface (it's bad)
I/O busses - Answers EIDE, ATA, SATA, USB, Fibre Channel,
SCSI, SAS, Firewire
Host controller - Answers Uses bus to talk to disk controller built
into drive or storage array
Seek time is equal to what? - Answers Seek distance
Bandwidth - Answers Is the total number of bytes transferred, divided by the total time
between the first request for service
and the completion of the last transfer
SSTF - Answers Shortest seek time first, is a form of SJF but may cause starvation of some
requests.
Storage area networks (SANs) - Answers Network in which many hosts attach to
many storage units
Network-attached storage (NAS) - Answers A storage made available over a network rather than
over a local connection (such as a bus)
RAID 0 - Answers Striped parity no mirror minimum 2 disks
RAID 1 - Answers Mirroring minimum 2 disks
RAID 0+1/ RAID 1+0 - Answers Striped mirroring minumum 4 disks high reliability
RAID 3,4,5 - Answers Block interleaved parity much less redundancy
