MICROPOLIS 2112A DISK DRIVE SPECIFICATIONS Model Number Unformatted Capacity: 2112A-15 Total Mbytes -------------- 1220 ----------------- Disk Platters ----------------- 8 ----------------- Read/Write Heads ----------------- 15 ----------------- Cylinders --------------- 1760 ----------------- Bytes per track ----------- VARIABLE ----------------- Formatted Capacity Total Mbytes --------------- 1050 ----------------- Bytes per Sector ---------------- 512 ----------------- Sectors per Track ----------- VARIABLE ----------------- Performance Specifications Seek Time Adjacent Track 1.5 msec (including settling time) Average 10.0 msec Maximum 25 msec Average Rotational Latency 5.56 msec Rotational Speed 5400 rpm +/- 0.5% Data Transfer Rate at Interface Up to 5.6 Mbytes/sec Internal Data Rate 24 to 40 MHz MTBF 300,000 hours Positioner Fully balanced rotary voice coil Parking Automatic park and lock General Functional Specifications Interface AT/IDE Supports Full Common Command Set YES Mounting Plane Any orientation Power Requirements +12V +/-5% 0.75A Avg (2.0 max during start-up) +5V +/-5% 1.0A avg Power dissipation, typical 11.5 Watts 7. Drive Options ____ _______________________ ________ # J2 # # J1 # # J3 # # #_#_______________________#_#________# # # # RESERVED # # # # # # # : : : : : # # # # # # W1 # # # W2 # # # \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ # LED # #________##_______________________________# W1, W2 Jumpers (Master / Slave Selection) The interface allows up to two drives (a Master and one Slave) to be attached to the AT/IDE bus. The following table shows the configurations. W1 W2 Description +------+------+-------------------------------------------------------+ # IN # IN # Drive emulates *both* Master and Slave (DEFAULT) # +------+------+-------------------------------------------------------+ # OUT # IN # Drive is Master, Slave is present # +------+------+-------------------------------------------------------+ # IN # OUT # Drive Slave # +------+------+-------------------------------------------------------+ # OUT # OUT # Drive is Master # +------+------+-------------------------------------------------------+ DRIVE EMULATES BOTH MASTER AND SLAVE Specifies that one 2112A drive can emulate both the Master drive (Drive 0) and the Slave drive (Drive 1). This option allows for existing host systems to utilize the full capacity of the drive. When the drive is configured as both the Master and the Slave, the Master's (Drive 0) capacity is set to: 1024 logical cylinders, 16 logical heads, and 63 logical sectors. This setting yields 528,482,304 bytes. The Slave's (Drive 1) capacity is set to the remaining storage on the disk drive. For this configuration, the recommended drive type setting in your computer's CMOS memory is as follows: Drive 0 Drive 1 Logical Cylinders: 1024 1010 Logical Heads: 16 16 Logical Sectors: 63 63 NOTE: The capacity of the 2112A drive may exceed the capacity that the host can access. This limitation stems from the communication link between the DOS and the BIOS. A typical limit is: 1024 cylinders 16 heads 63 sectors For optimum use of the following options, the BIOS may need to be modified. DRIVE IS MASTER, SLAVE IS PRESENT Specifies the Master drive (Drive 0) when two 2112A drives are used in the system. The other drive is the Slave. DRIVE IS SLAVE Specifies the Slave drive (Drive 1) when two 2112A drives are used in the system. The other drive is the Master. NOTE: If you have a machine with a BIOS that supports over 16 heads, you can get the drive to work as one full partition. To do this, set the drive for: 991 cylinders 64 heads 32 sectors DRIVE IS MASTER Specifies the Master drive (DRIVE 0) when one 2112A drive is used in a system. NOTE: If you have a machine with a BIOS that supports over 16 heads, you can get the drive to work as one full partition. To do this, set the drive for: 991 cylinders 64 heads 32 sectors