| 360 / | HD | DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL | 
| 88 | DF | RECORD TRANSPORT WITH HEAD STATIONARY DURING TRANSDUCING {4} | 
| 97.01 | DF | .~ Disk record {6} | 
| 97.02 | DF | .~.~ Environmental control (e.g., air filter, temperature control) {2} | 
| 97.03 |  | .~.~.~ Plural disks |