Learning unit 5 Flashcards
What is HDD rated by?
-Its physical size
-Capacity
-Speed
-Technologies used inside
-Interface standards
What type of technologies are used in HDDs?
-Magnetic
-Solid state
Describe a magnetic hard Drive
One or more disks stacked together, spinning in unison inside a sealed metal housing
What is the role of firmware?
It controls data reading, writing and motherboard communication
Describe a solid state drive
-It has no moving parts
-Its non-volatile
-Memory is NAND flash
-Its more expensive
Describe a Hybrid HDD or Solid State hard drive
It contains magnetic and solid state technologies and it permanently holds data
What is the role of S.M.A.R.T?
To predict when a drive is likely to fail
What does S.M.A.R.T stand for?
Self Monitoring Analysis and Reporting Technology
What does system BIOS/UEFI use S.M.A.R.T for?
To monitor disk spin time and the mechanical activities of the drive
What does S.M.A.R.T do when a drive is about to fail?
It displays a warning message
List the interface standards used by hard drives
-SATA
-NVMe
-SCSI
-IDE
What should you consider when selecting a hard drive
-Technology
-Form factor
-Data transfer
-Spindle speed
-Buffer size
-Capacity
Explain RAID ( Redundant array of inexpensive disks)
Its a technology that configures two or more disks to work together as an array of drives
Why do people use RAID?
To increase performance and increase fault tolerance
List the type of RAID variations
-RAID 0
-RAID 1
-RAID 10
-RAID 5
-SPANNING (JBOD)
Explain RAID 0 (stripped volume)
Uses 2 or more disks to increase the disk space available for a single volume
-It writes evenly on physical disks so that neither receives all activity thus improving performance
Explain RAID 1 (mirrored volume)
It duplicates data on 1 drive to another and is used for fault tolerance
-Each drive has its own volume and the 2 volumes are called mirrors
-If one drive fails the other continues to operate and data is not lost
Explain RAID 5
It stripes data across drives and uses parity checking
-If one drive fails the others re-create the data stored on the failed drive by using the information
-Data isn’t duplicated so it makes better use of volume capacity
-It increases performance and fault tolerance
Explain Spanning
Uses 2 hard drives and when 1 fails the other is used
-The purpose is to increase the amount of disk space available for a single disk volume
Explain RAID 10`
Its a combination of RAID 1 & 0.
-It takes at least 4 disks
-Data is mirrored across pairs of disks
