RAM & Storage( Comptia Objective 3.4)

Question 1

What is the data transfer rate of SATA revision 3?

Answer 1

• Has a maximum Data rate of 6gbps

- Has a transfer rate of 600mbps

Question 2

What is the data transfer rate of SATA revision 3.2?

Answer 2

• Has a maximum Data rate of 16gbps

- Has a transfer rate of 1969 mbps

Question 3

What is RAID?

Answer 3

• Redundant Array of Independent Disks
• Designed to increase speeds of read and write to a storage volume while also having the option to provide fault tolerance( prevent loss of data)

Question 4

What is RAID 0?

Answer 4

• Data is striped across drives in an effort to increase performance
• It does not offer any redundancy( No fault tolerance)
• Requires a minimum 2 drives to operate.

Question 5

What is RAID 1 ?

Answer 5

• Mirroring. Data is copied to two identical disks. In event one drive fails the other continues to operate and data can be recovered therefore offering redundancy.
• 2 drives are used and 2 only

Question 6

What is RAID 5?

Answer 6

• Striping with a parity bit
• Data is striped across multiple disks, as is parity information which is fault tolerant thus offering redundancy.
• If one disk fails the array can reconstruct data from parity bits
• Requires a minimum 3 drives

Question 7

What is RAID 10?

Answer 7

• Combines the advantages of RAID 1 and RAID 0
• Provides redundancy via a stripe of mirrors. Typically 2 mirrored disks are then striped across all drives
• Minimum number of disks required 4.

Question 8

What capacity does a typical SD Card hold ?

Answer 8

• 4GB

Question 9

What is a SDHC and how much data does it hold?

Answer 9

• High Capacity SD Card

- Range in storage up to 32gb

Question 10

What is SDXC and how much data does it hold?

Answer 10

• Extreme capacity SD Card

- Holds up to 2TB of storage data at rates up to 90mbps

Question 11

What is SDUC and how much data does it hold?

Answer 11

• Secure Digitial Ultra Capacity SD card

- supports up to 128TB of storage @985 MB/s data transfer over SD express bus.

Question 12

What is the difference between the terms discs and disks?

Answer 12

• Disk is a term used to described media stored on a magnetic “disk” such as a hard drive
• Disc is the term used to describe media stored on an optical “disc”

Question 13

What is the difference between CD-ROM, CD-R and CD-RW?

Answer 13

• CD-ROM = Compact disc read only memory. Data can be viewed/listened/watched but data can’t be written to the disc
• CD-R = Compact disc read and write. Data can be accessed and data can also be written to the disc once only.
• CD-RW = Compact disc read and re-writable. Data can be re-written many times to the same disk and accessed as well.

Question 14

What is the typical write speed to a CD-R?

Answer 14

• 48x(7.2MB/s) or 52x(7.8MB/s)

- Speeds are determined by multiplying the number preceeding the x by 150kb

Question 15

What is the typical write speed to a CD-RW?

Answer 15

• 24x(3.6 MB/s) or 32x(4.8MB/s)

- Speeds are determined by multiplying the number preceding the x by 150kb

Question 16

What is a good tool to keep in your kit to deal with dislodged optical trays?

Answer 16

• A Paperclip is very useful for this also the sim card removal tool that comes with a mobile device will do.

Question 17

What are the specs for DVD-Rom tech DVD-5?

Answer 17

• Has 1 side and 1 total layers

- Total capacity of 4.7gb

Question 18

What are the specs for DVD-ROM tech DVD-18?

Answer 18

• Has 2 sides and 4 total layers

- Total capacity of 17GB

Question 19

What is the difference between BD-R and BD-RE bluray formats?

Answer 19

• BD-R = Bluray Disc Recordable data can be accessed while data can be written to the disc just once
• BD-RE = Bluray Disk Recordable Erasable(BD-RE) data can be written to disk and written again multiple times.

Question 20

What are the specs for DVD-RW SL Drives?

Answer 20

• Has a write speed of 6 x, and a capacity of 4.707GBS

Question 21

What are the specs for DVD-RW DL Drives?

Answer 21

• Has a write speed of 6 x and a capacity of 8.544GBS