NEC APC-H26/H27 Expansion Hard Disk and Hard Disk Subsystem For NEC-APC Computer
The APC disk subsystem is used as an external storage device in an APC system . It comes as a stand-alone Disk Unit (DKU), model APC-H26, and an expansion DKU, model APC-H27. The stand-alone DKU is also referred to as the master and the expansion unit as the slave. Each model provides a disk storage capacity of approximately 10 Megabytes (MB) of formatted data. When installed together they provide an overall storage capacity of approximately 20 MBs. Included in each model is a sealed multidisk module designed to improve the operational reliability by minimizing contaminents on the recording surface . Operational reliability is further improved with the use of magnetic heads with NEC Large Scale Integration (LSI) circuits designed to enhance the weakest signals. The model APC-H26 contains the interface and control logic for the stand-alone and the expansion DKUs on a single Printed Circuit Board (PCB), called the 3302 Format (FMT) control PCB. Both the stand-alone and expansion DKUs contain their respective disk drive electronics. The APC control unit houses a disk controller, called, the Disk Adapter PCB. This adapter connnects directly with the 3302 FMT PCB in the stand-alone DKU , and contains the interface logic to support the appropriate APC system configuration.The APC Disk Units (DKU) are compact, fast-access data storage devices designed for use with an APC system. Data is stored on 5.25 inch rrietal-oxide-coated disks that are mounted on a common rotating spindle and, along with the Read/Write (R/W) heads, are housed in an air-tight, sealed module. This arrangement assures maintenance-free operation, negating maintenance checks. The metal oxide coated disks are also known as platters. 1-1 General Description 1-2 Both models contain four 2-sided disks; each disk surface is equipped with a pair of Winchester type magnetic R/W heads. The R/W heads are supplied as standard equipment and are structured on a swing out mechanism driven by a stepping motor assembly. All heads incorporate a preamplifier to improve read data signal-to-noise ratio. Depending on the disk configuration, that is, a stand-alone only or a stand-alone and an expansion disk unit, the disk system is capable of storing approximately 10 or 20 MBs of formatted data at a ma.ximum recording density of7480 bits per inch. The recording method used is the Modified Frequency Modulation (MFM) technique, and the data transfer rate is 500 KBytes per second.The model disk units currently available for the APC are listed below and are briefly described in the preceding text.
Model APC-H26 Stand-alone DKU (Master Unit).
Model APC-H27 Expansion DKU (Slave Unit).
Shipping :
Europe : The price is for Air Priority Shipping with tracking number – takes about 8 – 15 working days !
USA and other Countries : The price is for Air Shipping with tracking number – takes about 15 – 25 working days !
Shipping Information:
Every Item is carefully packed and put in special box or special envelope for that use. We use our Bulgarian Post Services to send The Items Abroad. They are very reliable and good working. Every Item We send has an Tracking Number and can be tracked all over the World.
Return Policy Details:
We Accept Money Back and Replacement. The Important thing is the Buyer to be satisfied ! Please if you have any questions feel free to ask us. We will answer them As soon as we can. Wish you all best from Bulgaria !
Feedback :
Dear Customers, the Computer Parts we sell are about 20 years old. We test them twice – one time before the listing and one after the Item is Sold. We packed them with anti-static bags and put them in boxes.
Please if you have any issues with the parts when you test them contact us before leaving an feedback and We will do everything to help you !
There are no reviews yet.