Quantum DAT 240 Loader Manual de usuario descargar pdf (Pagina 46)

Scorpion 240 Product Manual

Write head B

Write head A

20˚ head azimuth

3 tape tracks

Figure 19 Alternating azimuth angles on tape tracks

Motors and control circuits

The Scorpion 240 drive uses four direct-drive, brushless motors—the capstan,

cylinder and two reel motors. Using these small, direct-drive motors provides

maximum reliability. The cylinder motor rotates the cylinder. The capstan motor

moves the tape. The two reel motors turn the tape reels.

The cylinder, capstan and reel servos are controlled by custom ASICs and the motor

control firmware.

The fifth motor in the mechanism is a brush-type mode motor. This motor controls

(selects) the mechanism mode. Because the mode motor is not frequently used, and

due to space and torque requirements, a brush-type motor is best suited to this

application. The mode motor performs the mode changes as directed; for example,

this motor conditions the mechanism to eject the cartridge.

Timing tracking circuitry

The timing tracking circuitry of the drive is designed to provide high precision tracking

and head positioning. The timing tracking system, in conjunction with the four-head

read-after-write (RAW) design provides for reliable high-density data recording with

maximum storage efficiency.

Signal-processing electronics

The signal-processing electronics circuitry in the drive is made up of several

components. The drive’s main control microprocessor, data engine, and data buffer

management circuitry are all integrated in a single IC package. A single chip DDS

formatter LSI communicates with the microprocessor and with the read and write

LSIs. Other vital components are the high-performance SCSI LSI chip, the flash

memory, and the DRAM buffer memory.

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Quantum DAT 240 Loader Manual de usuario Pagina 46