Seagate manual Characteristics ST118202LW/LC

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Cheetah 18 Installation Guide, Rev. A	17
Characteristics	ST118202LW/LC
Interface	Ultra2 SCSI1
Capacity
Unformatted (Gbytes)	22.54
Formatted (Gbytes)2	18.21
Recording
Cylinders (user)	6,962
Read/write data heads	24
Avg bytes/track	104,840-159,008
Access time3
Average read (msec)	5.9
Average write (msec)	6.7
Disc rotation
RPM	10,025
Average latency (msec)	2.99
Synchronous data transfer rate
Maximum instantaneous (Mbytes/sec)	40 (SE mode)
	80 (LVD mode)
Asynchronous data transfer rate
Maximum instantaneous (2 bytes wide)	10.0
(Mbytes/sec)
Multi-segmented cache (kbytes)	1,024 standard
	4,096 optional

1.Also operates per SCSI-1/SCSI-2/SCSI-3 protocols.

2.The specified formatted capacities are calculated with the standard OEM sector size (512 bytes per logical block) and sparing.

3.Includes on-board controller overhead.

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Contents Cheetah Disc Drive ST118202LW/LC Installation Guide Contents Electrostatic discharge protection PrefaceImportant safety information and precautions Page Wichtige Sicherheitshinweise Page Cheetah 18 Installation Guide, Rev. a Electromagnetic susceptibility Regulatory agency complianceElectromagnetic compliance for the European Union Seagate Technology support services SeaNET Seagate CompuServe forum Online servicesSeaFAX FAX servicesTechnical support Direct-support servicesCustomer service centers Manufacturer’s representatives General description Cheetah 18 family drive ST118202LW shown Characteristics ST118202LW/LC DC power requirements ±5%1 +5 +12 General information Drive modelsScsi ID jumpers Single-ended and low voltage differential modesPage Drive termination Circuits and data path widths Terminator powerCable characteristics for SE and LVD circuits Pin I/O connection to drive LW model Multiple-drive connection to host adapter Drive model LC with single 80-pin I/O and power connector Providing adequate cooling Kühlung des Systems Suggested air flow Installation des Laufwerkes und Anschluß der Kabel Mounting the drive and connecting cablesCheetah 18 Installation Guide, Rev. a DC power connector Abbildung 8. Gleichstromanschluß Hinweis Page Mounting configuration dimensions LW model Mounting configuration dimensions LC model Quick reference desktop system notes Formatting the driveLW drives Setting the Scsi ID jumpersTerminating the drive Setting terminator power jumpers Several other jumper options are available as illustrated Other applicable jumper optionsAdditional jumper options Drive Active LED indicator connections are shown below Drive Active indicatorLC drives Terminating the drive Other option jumpers are available as illustrated below Drive Active indicator

Cheetah 18 Installation Guide, Rev. A

Characteristics

ST118202LW/LC

RPM