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T111

T111. Storage. Storage Types. HDD Optical media Flash media (USB drives / SSDs) Tape Floppy NAS Off-site. Hard Disk Drive (HDD). Hard Disk Drives are the main type of secondary storage Currently store up to 2TB of data Relatively cheap per GB

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T111

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  1. T111 Storage

  2. Storage Types • HDD • Optical media • Flash media (USB drives / SSDs) • Tape • Floppy • NAS • Off-site

  3. Hard Disk Drive (HDD) • Hard Disk Drives are the main type of secondary storage • Currently store up to 2TB of data • Relatively cheap per GB • Uses moving parts so can be prone to failing • 2.5” or 3.5” form factor

  4. HDD

  5. HDD Facts • Consider this little comparison - if the read/write head were a Boeing 747, and the hard-disk platter were the surface of the Earth: • The head would fly at Mach 800 (980,035 KMph) • At less than one centimetre from the ground • And count every blade of grass • Making fewer than 10 unrecoverable counting errors in an area equivalent to the North Island.

  6. Types of HDDs • PATA (Parallel Advanced Technology Attachment)

  7. Types of HDDs • SATA (Serial Advanced technology Attachment)

  8. HDD capacity over time

  9. HDD Performance • The performance of a HDD is composed of: • Drive RPM • 5400, 7200, 10000, 15000 • Seek time • Buffer Memory (MB) • RAID

  10. RAID • Redundant Array of Inexpensive Disks • Combine two or more drives to improve performance / redundancy or both • RAID 0(striped), 1(mirrored), 5(striped with parity) • We will examine RAID in more detail later in the course

  11. Solid State Drives (SSDs) • Use flash memory • No moving parts • Vary in speed but can be quicker than HDDs • May have longevity issues

  12. Solid State Drives (SSDs) • Hard Disk Drive • Solid State Drive

  13. SSD Performance • http://www.youtube.com/watch?v=96dWOEa4Djs

  14. Tape Drives • Uses magnetic tape media • Sequential data access • High density • Can have relatively fast transfer rates • Good for archiving data

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