Storage Devices Flashcards
(74 cards)
Where are 2.5-inch HDDs most common?
Laptops and smaller devices
Where are 3.5-inch HDDs most common?
Desktops and larger devices
Where are 5.25-inch HDDs most common?
Optical drives, tape drives, and legacy floppy drives
Platters
Metal or glass discs coated with a magnetic substance
How does the actuator and read/write head access data?
Moving over sectors and tracks
Tracks
Circular paths on the platter
Sectors
Segments of tracks
What size are most sectors?
Typically 512 bytes per sector
Seek Time
Time required to locate data on the platter
Revolutions Per Minute (RPM)
Determines speed and performance
5400 RPM
Budget/low-end
7200 RPM
Common in modern computers
10,000 RPM
High-performance systems
15,000
Rare due to cost and competition from SSDs
Buffer size
Internal cache that improves performance
Throughput calculations
Times the numerical value of the SATA speed by 100
IDE/PATA
Legacy interface with 40-wire or 80-wire flat ribbon cables
Narrow SCSI
40 Mbps
Wide SCSI
320 Mbps
SAS-1
3 Gbps
SAS-2
6 Gbps
SAS-3
12 Gbps
SAS-4
22.5 Gbps
Which versions of SATA are compatible with SAS in server environments?
SATAs 2 and 3