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- ISO images created by most mastering programs can be mounted as a drive
- under DOS using SHSUCDHD. This format was adopted in the SHSUCD13
- release and has not been subsequently changed. If you did not use a prior
- version you need not read the remainder of this document.
-
- SHSUCD13
- May 1996
-
- Warning! Warning! Warning! Warning! Warning! Warning! Warning! Warning!
-
- The format of the cache images used by the programs in SHSUCD13 differs from
- and is not compatable with the cache images of previous versions of SHSUCD.
- If you do not use cached images this will not affect you because the change
- has no effect on "real drives".
-
- Previous versions did not cache the system area of a CD. Block zero was
- omitted entirely and blocks 1 thru 15 were zeroed. Programs in this version
- cache and use the entire volume space including the system area. Thus
- existing cache images must be converted to the new format before they can
- be used by the programs in this archive.
-
- If you do not want to convert existing images you can still use the updated
- version of SHSUCDX included in this archive. The programs SHSUSERV, SHSUCDHD
- and CDCACHER all use the new format and cannot be used with old image files.
-
- The conversion consists of appending a 2048 byte block of nulls to the
- beginning of the existing cache image. This can be done with the DOS copy
- command and the included 2KBLOCK.DAT file. The command is:
-
- COPY /b 2KBLOCK.DAT + OLD.IMG NEW.IMG
-
- You must have enough disk space to accomodate both the new image and the old
- image while it is being copied. The old image can be deleted after the
- conversion is completed and verified. Unfortunately, it takes a while to
- copy a 650 MByte image.
-
- The new format is compatable with the format of the files created by the
- shareware program CD2FILE. Thus files created with CD2FILE, and perhaps
- others that I do not know about, can now be used with both the SHSUCDHD
- pseudo driver and the SHSUSERV programs.
-
- My apologies for the problems I am caausing by changing the format. I
- should have changed it long ago. A request by Olaf Marx
- <omarx@adler.biologie.Uni-Osnabrueck.DE> to make it compatable with the
- CD2FILE format finally prompted me to get on with it. Thanks Olaf.