Micropolis 1320/1330-Series

DRIVE SERIES SPECIFICATIONS

DRIVE SPECIFICATIONS - 1320/1330 SERIES

Capacity

Model Number
	1323/1333	1323A/1333A	1324/1334	1324A/1334A	1325/1335

Unformatted Capacity (MBytes)
	42.7		53.3		64.0		74.7		85.3

Disk Platters
	3		3		4		4		5

Read/Write Heads
	4		5		6		7		8

Formatted Capacity (MBytes)
	35.6		44.5		53.4		62.3		71.3


(All other specs are common for all members of the 1320 and 1330 Series)

	Bytes per Sector	512

	Sectors per Track	17

	Cylinders		1,024

	Bytes per Track		10,416

Note that all drives from 13xx series are based on the same chassis. Please refer to other models, like model 1325 and the respective series overview pages for more technical info: 1300 series, 1350 series, 1370 series

Example Video (Micropolis model 1325)

Illustration

Platters and r/w-heads of an openened hard-disk-drive — Opened Micropolis 1325 hard-disk-drive, showing data surfaces (platters) and r/w-heads
Illustration from the Micropolis Data Storage Guide

The 1320/1330 series are MFM drives with an ST-412 interface.

PC Drive Types

Examine the entries in your system drive table and find the type that most resembles the head and cylinder parameters of the drive without exceeding these parameters. If you are using third-party installation/partitioning software, follow the instructions included with the software, as it may perform this step automatically.

Performance

Data Rate

	Seek Time (including settling time)

		Track-to-Track		6 msec

		Average			28 msec

		Maximum			62 msec


	Avg. Rotational Latency		8.33 msec

	Rotational Speed		3600 rpm +/- 0.5%


	Data Transfer Rate		5 Mbits/sec

	Optimum Step Rate		20 microseconds or faster (buffered seek)


	MTBF (power-on hours)		35,000 (1320-Series)
					25,000 (1330-Series)


	Positioner			Fully balanced rotary voice coil

	Parking				Automatic park and lock

General Functional Specifications

	Form-Factor				5 1/4-inch, "full-height"


	Interface				ST-506/412

	Encoding Method				MFM (Modified Frequency Modulation)
		Although these drives may be capable of functioning in an RLL environment,
		Micropolis does not certify or warrant them for this application.

	Sectoring				Soft

	Write Precompensation Start Cylinder	1024
	Reduced Write Current Start Cylinder	1024
	Landing Zone				1024


	Mounting Plane				Any orientation

Power Requirements

	+12V +/-5% (average)			2.0 A

	+12V +/-5% (max. during start-up)	3.9 A

	+5V +/-5% (average)			0.9 A


	Power Dissipation, typical		29 Watts