Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!LL.ARPA!SAGE From: SAGE@LL.ARPA Newsgroups: comp.os.cpm Subject: CP/M Directory Entries Message-ID: <8803141649.AA29511@ucbvax.Berkeley.EDU> Date: 14 Mar 88 15:46:02 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 13 Local Cc: SAGE Message-ID: his is the classic problem of logical vs physical. In one case extent' is used to refer to the contents of one directory entry (32K or 56 logical records -- physical records probably only 32 or 64!). The ogical extent is always 16K, and thus there can be two logical extents n one physical extent, just as there can be 2 or 4 or 8 logical records 128 bytes) in each physical record. The extent number in the directory ntry is the number of the last extent in that directory, and the record ount is the number of logical records in that last extent. With larger lock sizes on a hard disk it is quite possible to have 4 or probably ven 8 logical extents per physical extent. The same rules apply.