A data storage system includes data storage and a record locator data structure in random access memory. The record locator data structure includes entries having different lengths. For locating variable-length data records in the data storage, for example, at least some but not all of the entries have...http://www.google.com.hk/patents/US6587919?utm_source=gb-gplus-share專利 US6587919 - System and method for disk mapping and data retrieval
