The HP approach of using independent tape threading mechanisms was the breakthrough that enabled the DAT160 drive to write and read DAT-72 and DAT-40 media. When the concept of loading two different heights of cartridge with two different tape widths was invented, HP used extensive computer simulation techniques to model the tape threading and routing for each tape type. The results of these simulations indicated that the design concepts were both practical and yielded good levels of margin in allowing the design to be successful.
The most difficult challenge has been accommodating all the mechanical components in the physical space available. However, using the HP standard product design and testing methodology, the necessary mechanical solutions and enhancements have been evolved. The robust engineering and margin in these tape guides are the keys of a successful interchange.
-Shawn Paulhttp://www.tape4backup.com
