DOS ain't dead

DOS copy command (Developers)

posted by georgpotthast , Germany, 26.09.2010, 21:37

I am testing with MS-DOS 7.0. When I use the DOS copy command to copy a file of 515 MB to a different name on the same disk it takes about 20 seconds.

I wrote a small test program in assembler which opens and then reads the same file in 64k blocks using function 3Fh. It does not write the file to a different name, just reads it. This program takes 77 seconds just to read the file.

Why is copy that much faster and how am I able to access the file just as fast as copy?

Georg

Complete thread:

• DOS copy command - georgpotthast, 26.09.2010, 21:37 (Developers)
  • DOS copy command - ecm, 26.09.2010, 23:46
  • DOS copy command - Japheth, 27.09.2010, 02:06
  • DOS copy command - georgpotthast, 27.09.2010, 21:28
    • DOS copy command - ecm, 27.09.2010, 21:40
      • DOS copy command - georgpotthast, 27.09.2010, 22:46
        • DOS copy command - bretjohn, 28.09.2010, 00:15
          • DOS copy command - ecm, 28.09.2010, 01:16
            • DOS copy command - Rugxulo, 28.09.2010, 05:37
            • DOS copy command - Rugxulo, 28.09.2010, 22:40
              • DOS copy command - Rugxulo, 30.09.2010, 06:51
                • DOS copy command - georgpotthast, 30.09.2010, 19:59
                  • DOS copy command - tom, 01.10.2010, 15:12
                    • DOS copy command - georgpotthast, 02.10.2010, 22:56
                      • DOS copy command - RayeR, 08.10.2010, 10:10
            • DOS copy command - nidud, 03.10.2010, 17:17
          • DOS copy command - georgpotthast, 28.09.2010, 21:04
            • DOS copy command - ecm, 29.09.2010, 14:05
  • DOS copy command | FATPLUS.EXE - DOS386, 13.10.2010, 04:02