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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><HEAD> <META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20"> <TITLE>Diskette Sector I/O Routines: Converting sector numbers</TITLE> <LINK HREF="dio-2.html" REL=previous> <LINK HREF="dio.html#toc3" REL=contents></HEAD><BODY>Next<A HREF="dio-2.html">Previous</A><A HREF="dio.html#toc3">Contents</A><HR><H2><A NAME="s3">3.</A> <A HREF="dio.html#toc3">Converting sector numbers</A></H2><P>Since the read and write functions expect a sector number, for systems wherethe sectors aren't addressed by a logical sector number (e.g. CBM drives),there are 2 conversion functions. One of them converts a logical sector numberto a head/track/sector triple. The other conversion function works the otherway round.</P><P><BLOCKQUOTE><CODE><PRE> unsigned char __fastcall__ dio_phys_to_log (dhandle_t handle, const dio_phys_pos *physpos, sectnum_t *sectnum);</PRE></CODE></BLOCKQUOTE></P><P>This function converts track/head/sector to logical sector number.</P><P><BLOCKQUOTE><CODE><PRE> unsigned char __fastcall__ dio_log_to_phys(_dhandle_t handle, const _sectnum_t *sectnum, dio_phys_pos *physpos);</PRE></CODE></BLOCKQUOTE></P><P>This function converts a logical sector number to track/head/sector notation.</P><P>Note, that on systems which natively use logical sector numbers (e.g. Atari),the conversion functions are dummies. They ignore head/track(<CODE>dio_phys_to_log</CODE>) or return them as zero (<CODE>dio_log_to_phys</CODE>).The logical sector number is returned as physical sector and vice versa.</P><HR>Next<A HREF="dio-2.html">Previous</A><A HREF="dio.html#toc3">Contents</A></BODY></HTML>⌨️ 快捷键说明
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