Storage Devices Flashcards

(74 cards)

1
Q

Where are 2.5-inch HDDs most common?

A

Laptops and smaller devices

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2
Q

Where are 3.5-inch HDDs most common?

A

Desktops and larger devices

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3
Q

Where are 5.25-inch HDDs most common?

A

Optical drives, tape drives, and legacy floppy drives

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4
Q

Platters

A

Metal or glass discs coated with a magnetic substance

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5
Q

How does the actuator and read/write head access data?

A

Moving over sectors and tracks

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6
Q

Tracks

A

Circular paths on the platter

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7
Q

Sectors

A

Segments of tracks

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8
Q

What size are most sectors?

A

Typically 512 bytes per sector

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9
Q

Seek Time

A

Time required to locate data on the platter

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10
Q

Revolutions Per Minute (RPM)

A

Determines speed and performance

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11
Q

5400 RPM

A

Budget/low-end

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12
Q

7200 RPM

A

Common in modern computers

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13
Q

10,000 RPM

A

High-performance systems

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14
Q

15,000

A

Rare due to cost and competition from SSDs

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15
Q

Buffer size

A

Internal cache that improves performance

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16
Q

Throughput calculations

A

Times the numerical value of the SATA speed by 100

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17
Q

IDE/PATA

A

Legacy interface with 40-wire or 80-wire flat ribbon cables

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18
Q

Narrow SCSI

A

40 Mbps

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19
Q

Wide SCSI

A

320 Mbps

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20
Q

SAS-1

A

3 Gbps

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21
Q

SAS-2

A

6 Gbps

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22
Q

SAS-3

A

12 Gbps

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23
Q

SAS-4

A

22.5 Gbps

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24
Q

Which versions of SATA are compatible with SAS in server environments?

A

SATAs 2 and 3

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25
2.5-inch SSD form factor
Used in laptops and smaller desktops as a replacement for HDDs
26
1.8-inch form factor
Previously used in smaller laptops
27
mSATA
used for adapter cards
28
How does mSATA operate?
It uses combined data and power port on the motherboard
29
RAID
Combines multiple physical hard disks into a single logical disk
30
RAID 0
Striping with no redundancy
31
RAID 1
Mirroring with full redundancy
32
RAID 5
Data is striped across disks with parity information stored for redundancy
33
RAID 10
Data is mirrored within two RAID 1 arrays, which are striped together
34
How many disks does RAID 5 need?
A minimum of three
35
How many disks does RAID 10 need?
A minimum of four
36
Failure Resistant
Protects against data loss if a single disk fails
37
Which RAID configurations are Failure Resistant?
RAID 1 and RAID 5
38
Fault Tolerant
Continues functioning even if a component fails
39
Which RAID configurations are Fault Tolerant?
RAID 1 and RAID 5
40
Disaster Tolerant
Ensures access to data even if half of the RAID array fails
41
Which RAID configuration is Disaster Tolerant?
RAID 10
42
Which RAID configuration is best for high-speed applications?
RAID 0
43
Which RAID configuration is best for FULL redundancy
RAID 1
44
Which RAID configuration is best for redundancy with speed?
RAID 10
45
Hot Swappable
Allows devices to be connected and removed without shutting down the system
46
Do SATA devices support hot swapping?
Only when AHCI is enabled
47
SD speed
Up to 25 MBps
48
UHS-1
Up to 108 MBps
49
UHS-2
Up to 312 MBps
50
UHS-3
Up to 624 MBps
51
Tape Drives
Magnetic tape storage for backups
52
Standard tapes
140 GB
53
LTO Ultrium tapes
Up to 3 TB
54
USB 3.0 speed
5 Gbps
55
USB 3.1 speed
10 Gbps
56
USB 3.2 speed
20 Gbps
57
USB 4 speed
40 Gbps
58
eSATA II speed
3 Gbps
59
eSATA II speed
6 Gbps
60
CD storage
650 to 700 MB
61
DVD standard storage
4.7 GB
62
Dual-layer DVD storage
8.4 GB
63
Standard Blu-ray storage
25 GB
64
Dual-layer Blu-ray storage
50 GB
65
How do CDs read?
An infrared light with a long wavelength
66
How do DVDs read?
Red laser light with a medium wavelength
67
How does Blu-ray read?
Blue laser light with a short wavelength
68
Read-Only (ROM)
Pre-written discs; data cannot be modified
69
Write-Once (R)
Data can be written once and not erased
70
Write-Many/Erasable (RW/RE)
Data can be written, erased, and rewritten
71
X-Rating
Multiplier of the base data rate
72
CD X-Rating
1X = 150 KBps
73
DVD X-Rating
1X= 1.385 MBps
74
Blu-Ray X-Rating
1X = 4.5 MBps