+; This Routine uses the variables hostdsk and hostlba to find an Sector
+; in the Imagefile.
+; The CP/M Sector given within "hostlba" are splited to a logical Cluster-
+; Number and the Subsector within this logical Cluster.
+; logical Cluster Number = hostlba / fat_clustersize
+; The logical Cluster Number will be compared to the logical Cluster- Number
+; within the Cache. When this Clusters are the same and the DiskID's are
+; also the same, then the cached physical Sector will be used.
+; When the Clusters or the Disks don't match, a seek for the physical
+; Cluster is performed. This seek is done thru an access over the FAT of
+; the FAT16 Partition. The Routine starts at the first Cluster of the
+; Imagefile and goes along the linked list of Clusternumber till it reaches
+; the searched cluster. The found Clusternumber will be used to calculate
+; the Sektor where this Cluster lies on the SD- Card. Both the found physical
+; Cluster and the logical Cluster together with the physical Sectornumber
+; are stored in the cache.
+; The last step done is to add the SubSectorOffset to the found physical
+; Sector. This gives the pointer to the Sector to be read and or written.
+; ============================================================================