Micropolis 4345-Series



The 434X Tomahawk family is the lower capacity, half-height 3.5-inch (1 inch high) version of the higher capacity but full-height 3.5-inch drives from the 3391 series.

Tomahawk 4LP MODELS: 4345NS / 4345WS / 4345SS / 4345WD / 4345SD

(See Tomahawk 4LP AV Models: 4345AV and 4345WAV)
(See Tomahawk 9 Models: 3391XX)

Example Video (4345WS)

Formatted Capacity

Per Drive		4.55 GB
Bytes per Sector 512
Sectors per Track Variable
Cylinders 4,811


Data Rate

Avg. Seek Time (including settling time)	7.9 msec
Avg. Rotational Latency 4.17 msec
Rotational Speed 7200 rpm +/- 0.5%

Data Transfer Rate at Interface

Wide Synchronous		up to 40 MB/sec
Narrow Synchronous up to 20 MB/sec
Asynchronous up to 10 MB/sec
Internal Data Rate 76 to 125 Mbits/sec
MTBF (power-on hours) 1,000,000 (Computer-room environment)
650,000 (Office environment)
Positioner Fully balanced rotary voice coil
Parking Automatic park and lock

General Functional Specifications

Interface				Ultra SCSI (SCSI-3)
Supports Full Common Command Set Yes
Drivers/Receivers Available:
8-Bit ("Narrow") Single-Ended, Standard 50-pin Connector (Model 4345NS)
16-Bit Wide/Single-Ended, 68-pin Unitized Connector (Model 4345WS)
16-Bit Wide/Single-Ended 80-pin SCA-2 Connector (Model 4345SS)

Power Requirements

+12V +/-5% (average)			0.55 A
+12V +/-5% (max during start-up) 1.75 A
+5V +/-5% (average) 1.10 A

Power Dissipation, typical, idling 10 Watts
Power Dissipation, typical, seeking 12 Watts

Drive Configuration Information

Click on the drive model for Configuration/Specification Data Sheets in Adobe Acrobat format.

Model 4345NS, (8-Bit), "Narrow"/ Single-Ended, Standard 50-pin Connector
Model 4345WS, (16-Bit), Wide/ Single-Ended, 68-pin Unitized Connector
Model 4345WD, (16 bit), Wide/ Differential, 68-pin connector
Model 4345SS, (16-Bit), Wide/ Single-Ended, 80-pin SCA-2 Connector
Model 4345SD, (16 bit), Wide/ Differential, 80-pin SCA-2 connector

Drive Warranty Information