disk.ppt

Hard Disks • Low-level formatformat- organizes both sides of each  platter into tracks and sectors to define where items will be stored on the disk. • Partitioning: Partitioning: divide hard disk into separate areas called partitions; each partition fnctions as if it were a separate hard disk drive. • High-level format defines format defines the file allocation table !"#$% for each partition& which is a table of information sed to locate files on the disk.

'torage '(stems • Hard Drives  )  * $(pes: '+', and ,D • ,D drives )  originall( developed as alternative to more epensive '+', drives.  )  /odern versions called ,D drives.  )  'pport p to 0 mltigigab(te drives.  )  ,f (o want more devices& se '+', or 1'2  )  Low-level formatted at the factor(

Low Level "ormatting • Low level format scans disk for defects and sets aside sectors with defects so the( are not sed for data. • ,D drives shold never  be low level formatted b( a ser or technician. 3nl( high level format necessar(.

,nstalling ,D4,D drives • ,D spports $53 drives in a s(stem  )  one master !boot disk% and one slave  )  set master and slave sing 6mpers

• ,D spports "317  drives per s(stem  )  * drives on each of * cables  )  onl( one master& all others are slaves

• ,D and ,D drives both se 08-pin ribbon cable aligned to pin 9

Hard Drive

3perating '(stem "ile '(stems • D3' ses "#$ • 5indows . ses Cirtal "#$ • 5in A ses C"#$ and "#$* • 5in $ ses $"'

Partitioning • "D,'= command is sed • Divides hard drive into logical sbdivisions which are seen b( the operating s(stem as separate logical hard disks. • Hard drives divided into primar( and etended  partitions. $he primar( partition boots the s(stem. +an have p to 0 primar( partitions

Partitioning • tended can be divided p to * times on disk. • Partitioning disks improves disk efficienc( throgh redced clster size. • ,n D3'& 5in  and earl( versions of 5in A a hard disk over * B2 mst be divided into smaller partions •  ow 5in A and 5in A> can create a primar(  partition of p to > B2 • "ollowing partition& the first sector on c(linder 8 reserved for master boot record

2acking p data • #rchival: fll backp- contains everything  from the hard disk  • ,ncremental: contains onl( files that have been modified since last !previos% backp • Differential: backs p all the data modified since last full  backp • +op( backp: cop( dplicate of file& director(& or disk to another disk 

+D 73/ • +apacit( of @8 /2 • $ransfer speeds of arond *0E speed  )  E refers to the transfer speed in the first +D 73/& which was 98 = 

• +D is the slowest device on P+ • 5hen installing to ,D s(stem mst be configred as slave • 537/ and 3