Storage Unit Flashcards

Types of Storage

• Magnetic (hard drive)

• Optical

• Soild State

How many TB are there in 831, 500, 250 MB

851.500250 TB

How many KB are there in 851.50025 GB

831, 500, 250 KB

Soild State Drive

Optimally split evenly across all NAND cells to reduce the wear on a particular cell

Types of layers

• Single layer cell (best)

• Triple layer cell (second best)

• Multi layer cell (worst)

Hard Disk Drive Advantages

• Cheaper

• longer disk retention

• more capacity

Hard Disk Drive disadvantages

• Slower

• bulky

• Potential data loss from vibrations

Soild State Drive advantages

• Faster

• smaller

• not affected by vibrations

Solid state disadvantage

• Expensive

• smaller capacity

• shorter data retention

What does SMART stand for

Self monitoring analysis report technology

What does HAMR stand for

Heat Assisted magnetic recording

What is HAMR

The heated tip expands data space, the data contacts when the heat is taken away

Order of storage capacity

• Bit

• byte

• kilo

• mega

• giga

• tera

• peda

Signs of HDD failure

• freezing/ files not saving

• Loud pitch sounds

• Whirling (can't find file)

• Clicking (head moving back and forth)

What does POST stand for

Power on self test

What does CMR stand for?

Conventional magnetic recording

What does SMR stand for?

Shingled magnetic recording

Benefits of CMR

• Data is more far apart

• Better and safer

Benefits of SMR

• Cheaper

• More storage capacity

Disadvantages of SMR

• Slower

• More prone to data corruption

What does RAID stand for

Redundant Array of Independent disks

RAID 0

• Data is split evenly (50 50) across the MINIMUM OF 2 DISKS

• No redundancy

• Combined capacity

• Faster transfer speed

• Array is corrupt of one fails

RAID 1

• Data is copied identically MINIMUM OF 2 DISKS

• Mirror redundancy

• Half capacity

• Slower transfer speed

• If one fails, the other acts as back up

RAID 5

• Data is compressed in parity drives MINIMUM OF 3 DISKS

• Parity redundancy

• 70% total capacity

• Normal speed

• Can take 1-2 drive failures

• Easier to replace

RAID 10

• RAID 1+0

• Data is split evenly across two disks then mirrored to other two disks

• MINIMUM OF 4 DISKS

• Half capacity

• Normal transfer speed

• If more than one goes bad, the entire array could be corrupted

What is disk defragment

It reorganizes files into more optimal locations

What is disk clean up

It removes fragments from temporary files or uninstalled programs

What is f disk

It formats disk obsolete disk operating system (DOS) command to partition disk

What is the capacity of a zip disk

100 MB

What did /r do (includes /f)

• “Recovers” scans for bad sectors and recovers data

• Slower than /f

What is the capacity of a Compact disk

700 MB

What is the capacity of a DVD

4.7 GB

What is the capacity of a BluRay

25 GB