HP 3000 Manuals HP 3000 Manuals
GLOSSARY Autochanger A mechanism in the Model 20GB/A device which removes disks from the system's input area (mail slot), places them in storage slots, and accesses the appropriate disk to and from one of the drives. Cartridge See Magneto-Optical Disks. Disk See Magneto-Optical Disks. Flip The process where the picker rotates in order to switch the top side of the disk to the bottom. A flip cannot occur during a translate. formatting Preparing the surface of the optical disk for writing. The formatting task is performed with the INITMO command of MOUTIL. See initializing. Front Panel Includes a power switch, a control panel used to manage and display autochanger functions, and a place to insert and remove disks. initializing Creating volume set information on optical disks so that they can be mounted into the MPE/iX file system as private volumes. The initializing task is performed with the INITMO command of MOUTIL. See formatting. LDEV Parameter An integer value between 2 and 32767. (1 is reserved for a system volume which is used to boot from). It is used to identify a particular auto-changer or magneto-optical device. Magneto-Optical (MO) Rewritable Optical technology which uses a plastic disk with a magnetic layer. To write, spots on the magnetic layer are heated with the laser beam and magnetically polarized by the drive's magnet in one of two directions (representing either digital 0s or 1s). To read, a detector sees the rotation of the beam, reflected from the magnetic layer. Magneto-Optical disks (Also disks, cartridges and media.) All of these terms are synonymous with the 5.25-inch magneto-optical disks which can store 650 megabytes of data (325 megabytes per side). Mailslot The mailslot is where disks are inserted and removed from the Model 20GB/A. Media (pl.), or Medium (sing.) See Magneto-Optical Disks. Media Manager A system process that controls the magneto-optical disks within the Model 20GB/A device. media name The name of the media set made available for use by STORE/iX II. The media name is the name assigned during the STORE operation. MEDIA STG SLOT Parameter A number between 1 and 1000 specifying from which storage slot in the Model 20GB/A box the Magneto-Optical media should be obtained. media sub-name The name of the surface within the media set to use. The media sub-name is the sub-name assigned during the STORE operation. Picker The part of the Model 20GB/A that rotates, flips, and transports disks to and from storage slots, drives, and the mail slot. Read/Write Head This part of the disk drive assembly uses a laser and a magnet to read and write data on the magneto-optical disk. To write, a spot on the magnetic layer of the disk is heated by the laser to a point where it can be altered by the magnet. To read, the light from the laser is reflected from the spot. The magnetic alteration causes the light to be polarized in one direction (interpreted as a "1") or the opposite direction (interpreted as a "0"). Rear Panel The rear of the Model 20GB/A, which could be covered by a cabinet, provides voltage selection, SCSI connections, and drive address select switches. Rewritable Optical This is an optical disk technology in which data can be repeatedly written. scratching Making an optical disk surface available to STORE/iX II for rewriting. The scratching task is performed with the SCRATCH command of MOUTIL. SCSI An acronym for the industry-standard Small Computer Systems Interface. The HP-SC card is a SCSI host adapter card. SIDE Parameter A number specifying which side of the media is to be used. The number 1 specifies the "A" side of the Magneto-Optical media. The number 2 specifies the "B" side of the Magneto-Optical media. Storage Slots There are 32 storage slots for magneto-optical disks inside the Model 20GB/A. Swap The process where a picker replaces one disk in the drive with another, returning the first to its storage slot. Translate The process where the picker is moved vertically within the Model 20GB/A to the right side or vice-versa. Vertical Picker Move The process where the picker is moved vertically within the Model 20GB/A. Vertical moves are used to correctly position the picker in front of a storage slot and to position for translates. VOLNAME Parameter Volume Name. Any string of 1 to 16 alphanumeric and underscore characters used to uniquely specify and identify a volume on magneto-optical media. Write-Protect To protect the data on the disk from being erased or overwritten, use a write-protect tab located on either side of the disk cartridge.