3.3 Storage Devices Flashcards
1
Q
Hard Disk Drives (HDD)
A
- non volatile magnetic storage
- random access
- spinning platters with moving actuator arm
- moving parts eventually break
2
Q
Drive Sizes
A
HDD: 3.5 inch, 2.5 inch for laptops
SSD: 2.5 inch or 1.8 inch (uncommon)
M.2: smallest form factor, sizes vary
3
Q
HDD Speeds
A
5400 rpm
7200 rpm
10000 rpm
15000 rpm
4
Q
Solid State Drive
A
- non volatile
- no latency from moving parts
- very fast
- 2.5 inch SATA interface
5
Q
mSATA
A
- smaller SSD form factor
- replaced by M.2
6
Q
M.2
A
- smaller form factor
- sizes vary
- single connection to motherboard, no external power required
- SATA or NVMe
- B key: 2 lanes of bandwidth
- M key: 4 lanes of bandwidth
7
Q
NVMe
A
Non-volatile Memory Express
- used by M.2
- faster than SATA
- lower latency, supports higher throughput
- PCIe connection
8
Q
SATA
A
- protocol for how data is transferred between the motherboard and storage devices
- originally designed for HDDs
- supported by some SSDs
- uses AHCI to move drive data to RAM
9
Q
PCIe
A
- lower latency and high data transfer rates
- used by M.2 with NVMe
10
Q
Flash Drives and Memory Cards
A
- non-volatile
- limited number of rewrites
- USB, SD, miniSD, microSD, CompactFlash, xD
11
Q
Optical Drives
A
CD
CD-R (recordable)
CD-RW (rewritable)
DVD
DVD-ROM DL (dual layer) or DS (double sided)
Blu-ray Disc (BD)
CDFS is the file system for optical media
12
Q
RAID
A
Redundant Array of Independent Disks
- drive configuration for data redundancy
- different levels
13
Q
RAID 0 - Striping
A
- file blocks (data) is split between two or more physical drives = faster speed
- no redundancy
14
Q
RAID 1 - Mirroring
A
- file blocks are duplicated between two or more physical drives
- required disk space is doubled
- if one drive fails, the other drive still has the data
15
Q
RAID 5 - Striping with Parity
A
- at least 3 physical drives
- data is split along with a parity block
- parity allows computer to rebuild data if any drive fails
- you will lose data if more than 1 drive fails
