1. Give the measures of quality of a disk.
.
2. Compare sequential access devices versus random access devices with an example sequential access devices random access devices
Must be accessed from the beginning It is possible to read data from any location Eg:-tape storage Eg:-disk storage Access to data is much slower Access to data is faster Cheaper than disk Expensive when compared with disk
3. What are the types of storage devices?
4. Draw the storage device hierarchy according to their speed and their cost.
5. What are called jukebox systems?
Jukebox systems contain a few drives and numerous disks that can be loaded into
one of the drives automatically.
6. What is called remapping of bad sectors?
If the controller detects that a sector is damaged when the disk is initially formatted, or when an attempt is made to write the sector, it can logically map the sector to a different physical location.
7. Define access time.
Access time is the time from when a read or write request is issued to when data transfer begins.
8. Define seek time.
The time for repositioning the arm is called the seek time and it increases with the distance that the arm is called the seek time.
9. Define average seek time.
The average seek time is the average of the seek times, measured over a sequence of random requests.
10. Define rotational latency time.
The time spent waiting for the sector to be accessed to appear under the head is called the rotational latency time.
.
- Capacity
- Access time
- Seek time
- Data transfer rate
- Reliability
- Rotational latency time.
2. Compare sequential access devices versus random access devices with an example sequential access devices random access devices
Must be accessed from the beginning It is possible to read data from any location Eg:-tape storage Eg:-disk storage Access to data is much slower Access to data is faster Cheaper than disk Expensive when compared with disk
3. What are the types of storage devices?
- . Primary storage
- . Secondary storage
- . Tertiary storage
4. Draw the storage device hierarchy according to their speed and their cost.
- Cache
- Main memory
- Flash memory
- Magnetic disk
- Optical disk
- Magnetic tapes
5. What are called jukebox systems?
Jukebox systems contain a few drives and numerous disks that can be loaded into
one of the drives automatically.
6. What is called remapping of bad sectors?
If the controller detects that a sector is damaged when the disk is initially formatted, or when an attempt is made to write the sector, it can logically map the sector to a different physical location.
7. Define access time.
Access time is the time from when a read or write request is issued to when data transfer begins.
8. Define seek time.
The time for repositioning the arm is called the seek time and it increases with the distance that the arm is called the seek time.
9. Define average seek time.
The average seek time is the average of the seek times, measured over a sequence of random requests.
10. Define rotational latency time.
The time spent waiting for the sector to be accessed to appear under the head is called the rotational latency time.
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