DISK GEOMETRY TERMS:
[ 1: TRACKS: Concentric line path on which sectors reside. Many stacked tracks form a cylinder…
[ 2: SECTOR: Smallest unit of storage, fixed in length, some num of sectors reside on each track, 512 bytes/sector is standard size of sector…
[ 3: CLUSTER: Min disk space allocated to a file, determined by OS, e.g. 8 KB file on 1 GB drive. File will take 32 KB since that is cluster size…
[ 4: AVG ACCESS SPEED: The track required to read information from disk & transfer it into memory… 9 ms(fast)— 60 ms(slow)…
HDRIVE INTERFACES
â 1: ST – 506: 1st interface for Pc's, 5 mb/s transfer rate, Support 5.25" drive & 130 mb storage capacity, have 2 cables…
(1) 34 pin cable transfer cammands…
(2) 20 pin cable transfer data…
â 2: ESDI: Enhanced Small Drive Interface…
â 3: IDE: Integrated Drive Electronic… 12 mb/s, IDE interface is often integrated into MB, so there is no need for IDE card adapter work with max of 1024 cylinder of 528 mb…
â 4: EIDE: Enhanced IDE, 8GB disk size limit, 11—16 mb/s, the transfer rate can be 30 mb/s for HD & EIDE both support ultra DMA standards, support CD-ROM as well…
â 5: SCSI: Small Comp Sys Interface… Support up to 8 devices on 1 SCSI ribbon made cable. Types are followings…
Ø SCSI-1—-> 5mb/s
Ø SCSI-2—-> 20mb/s
Ø SCSI-3—-> 40–80 mb/s,16 devices…