| 摘要 |
<p>PURPOSE:To enable a host device to carry on a due process with no consciousness of occurrence of a deck fault by changing the correspondence between the logical and physical addresses of the deck within a peripheral controller and moving a medium via an access means. CONSTITUTION:If a fault occurs at a deck #0, for example, a microprogram processing part 13 checks the deck state storage part 121 in a deck control table 12 to search such a deck that contains no medium loaded and is not occupied by a host device. If a deck having a logical address '7' is not used yet, a medium is taken out of a deck #0 having a physical address '0' and given to an access means 3. Then an instruction is produced to load the medium into a deck #7 of a physical address '0'. Furthermore, the correspondence is changed between the logical and physical addresses of an address conversion means 11. Thus, it seems to the host device as if a fault occurred at the deck of the logical address '7'. Then an input/output request is normally carried out as it is with a logical address '0'.</p> |
