Storage Devices

Question 1

Hard drive Speeds

Answer 1

• 5,400rpm
• 7,200rpm
• 10,000rpm
• 15,000rpm

Question 2

Communication interfaces

Answer 2

• IDE
• SATA
  
  • SATA 1.0 = 150 MBps
  • SATA 2.0 = 300 MBps
  • SATA 3.0 = 600 MBPs
• SCSI

Question 3

SSDs

Answer 3

Solid State Drives

Question 4

NVMe

Answer 4

Non-volatile Memory Express

• Interface specification attached to the PCI Express interface
• Uses up to 4 PCIe lanes
• Replaces the SATA interface (originally designed for mechanical drives)
• Uses a U.2 connector for solid state drives

Question 5

Form factors of Storage Devices

Answer 5

• M.2
  
  • Examples: 2280 (22mm wide, 80mm length)
• mSATA
  
  • Common in portable devices
  • Largely being replaced by M.2
• 2.5
• 3.5

Question 6

Volatile vs non-volatile memory

Answer 6

the biggest difference between volatile and non-volatile memory is that volatile memory stores data when a computer is on but erases it as soon as the computer is switched off, whereas non-volatile memory remains in a computer even after the system shuts off

Question 7

What is a RAID 0 Array

Answer 7

Striping.
- no redundancy
- 2 disks used to store data quickly

Question 8

What is a RAID 1 Array

Answer 8

Mirroring.
1 level of redundancy
- 2 disks that store identical data

Question 9

What is a RAID 5 Array

Answer 9

Striping with Parity
1 level of redundancy with better performance
- 3 disks, each with a parity section that can be used to restore data if a dish fails

Question 10

What is a RAID 10 Array

Answer 10

4 disks
2 levels of redundancy
-two RAID 0 arrays that mirror against each other.