On Thursday 04 April 2002 07:33 am, Uncle George wrote: >DLT's are not flying head technology. They are like 9trk, QIC, i > think travan, colorado. The heads do not spin ( i had to think > about it ), as the heads move up & down to change tracks. But > the DLT 8000, now, also place the heads at an angle to tape > direction, as well as going up and down. I dont even think > there is an idler pully, just a tach. I'd like to know if there > is 'continual' tension on the tape while it is loaded ( on a > dlt )( Like that of a DEC Tape, or 9trk ) but I do not know.
I see, thanks. Interesting to see that asimuth changes are also being used to pack tracks tighter in the linear drives too these days. >But for whatever technology reasons the schemes that tape > mechanisms have evolved, they all rely on knowing what 'state' > that they are in. When you have a power outage, turn off the > drive, lightning, whatever, you may find that the tape left > inside the mechanism to be of little use to you. Quantum says > dont do that, AND i'd bet that the legal staff of the other > drive manufacturers will never certify that you will always > recover a tape left inside the mechanism. Since *you* are the tape changer in this case, I can see why the requested operations would be to your advantage. >Gene Heskett wrote: >>> I'd love to see the tapes stored and used at or slightly >>> below 50 >> >> degrees F, and <50% relative humidity as the tape is many >> times less abrasive then. Some TV stations have even gone so >> far as to store their tapes in a small room adjacent to the >> control room which is maintained in the 40 degree and <40% >> range. Everyting lasts longer, a lot longer. > >But i suppose that if you needed a tape right away, you'd have > to wait for the temp rise, otherwise ud get condensation on the > kolder tapes. As the control room in this case was handled by yet another duct from the same AC, and therefore pretty dry too, it wasn't a problem. Commercials came out, got loaded, played, and put away with not more than 5 minutes between the time they were brought out, and loaded into the players. With spinning head tech, any dew will tell you right quick as you'll load up a tape, and have 20 feet of it wrapped around the drum as the dew film will make it grab the spinning head. Its messy, and as our newsroom folks recently found, expensive. The locked up head drum proceeded to burn up the servo boards so badly we had to replace them, at $700 a copy, 3 copies, knocking out 3 of the 5 cameras they had. 14 pin tsop chips got so hot they burned halfway thru the epoxy board under them. We have at this point, discussed this well enough that the rest of the readers can make intelligent decisions based on the technology of their individual drives. -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 98.7+% setiathome rank, not too shabby for a hillbilly
