1. Storage and File Organization Flashcards
Volatile storage: ___
Example: ___
Loses contents when power is switched off
RAM
Non-Volatile storage: ___
Example: ___
Contents persist even when power is switched off
ROM (HDD)
Storage Hierarchy (6 levels)
Cache Main Memory (RAM) Flash Memory (flash drive and SSD) Magnetic Memory (HDD) Optical Disk (CDs or DVDs) Magnetic Tapes
On an HDD each surface of a ___ is divided into ___ that are divided into ___
Platter
Tracks
Sectors
On an HDD a sector is the smallest unit of ___ that can be ___
Data
Read or written
On an HDD a disk controller represents the ___ between the ___ and the ___
Interfaces
Computer System
Disk Drive Hardware
Access time is the time it takes ___
From when a read or write request is issued to when data transfer begins
Seek time is the time it takes to ___
Reposition the arm over the correct track
Rotational latency is the time it takes for ___
The sector to be accessed to appear under the head
Data-transfer rate is the rate at which ___
Data can be retrieved from or stored to the disk
Disk block is a ___
A logical unit for storage allocation and retrieval0
Sequential access pattern represents:
1- Successive Requests are for ____
2- Disk seek required for ___
1- Successive disk block
2- First block only
Sequential access pattern represents:
1- Successive Requests are for ____
2- Disk seek required for ___
Transfer rates are low since a lot of time is wasted in ___
1- Blocks that can be anywhere on the disk
2- Each access
# Seeks
I/O operations per second (IOPS) represents the ___
Number of random block reads that a disk can support per second
Mean time to failure (MTTF) represents the average time the ___
Disk is expected to run continuously without any failure