Description of optical storage Flashcards
1
Q
Description of optical storage
A
- Marks made on the service of a disk
- Light is reflected on the marks using a laser
- The reflection is read as 1 or 0
2
Q
Characteristics of optical storage
A
- Low capacity
- Low access speed
- Small in size so portable
- Not very durable (easily damaged)
- Fairly reliable
- Cheap per GB
3
Q
Purpose of secondary storage
A
- Long-term storage of files and data
* Non-volatile storage (is not lost when the computer is turned off)
4
Q
Number of TB in a PB
A
1000 or 1024
5
Q
Number of bits in a nibble
A
4
6
Q
Number of KB in a MB
A
1000 or 1024
7
Q
Number of MB in a GB
A
Samples per second x
Bits per sample (bit rate)
Channels x
Duration
8
Q
Calculation used to estimate file size of an image
A
No of pixels wide x
No of pixels high x
No of bytes per pixel x 1.1
9
Q
Calculation used to estimate the file size of a sound file
A
1000 or 1024
10
Q
Examples of solid-state storage
A
1000 or 1024
11
Q
Description of a bit
A
1 digit, either a 1 or a 0
12
Q
Number of GB in a TB
A
- Solid-state drive (SSD)
- USB memory stick
- SD card
