Checksum file corrupted

[Marjorie]

Configuration Information:
Version: NDD Pro 1.1
Application: DiskDoubler
Operating system: System 8.0

Hi - unfortunately, we did not read that NDD was incompatible with
system 8 until after we had used it to compress files. There were no
warnings that the compression did not work. However, when I go to
expand the files now, I receive the error message that the file is
damaged. Is there any way for us to recover these files? Also, I
read that you recommend using DD Expand, so does that mean that we
shouldn't compress with system 8 at all? We are still running both
systems 7 and 8 so I do have access to either system. Thanks for
your advice.

[Scott Crawford-Edgington]

Marjorie wrote:

Hello Marjorie,

The first thing to try is the DD Verify/Repair program. This is
available from our website at:

ftp://ftp.symantec.com/public/english_us_canada/products/disk_doubler_pro/ver1/updates/doublertools.sea.hqx.

The program is part of the "doublertools.sea.hqx" file. Most of the
time, the program is able to repair the file and allow DiskDoubler to
expand the file. If the program does not work, try these steps:

1. Start the expand process for the affected file.
2. Watch the progress bar until it gets just to the Verify portion.
3. At that exact moment, the file is actually on your drive, and is
only deleted when the verify fails. If you turn the computer off before
it tries to verify it, you should be able to recover the file from the
trash can. It should be in a folder called "Rescued Items from HD."

Below are some notes about running NDD Pro under OS 8.x. Keep in mind,
however, that we do not recommend running NDD Pro with OS 8.x and we do
not provide support for the configuration.

-CopyDoubler no longer works under OS8 and must be removed.
-The DiskDoubler(DD) Finder menu no longer works under OS8 and must be
removed.
-AutoDoubler (AD) works with the following caveats: it no longer
decompresses in the background. Instead, when AutoDoubler compressed
files are double-clicked, it will call the Disk Doubler (DD) program and
expand the file through that program in the foreground. Also, files
compressed automatically with AutoDoubler must be decompressed before
being copied to another volume. NOTE: Files compressed with the
DiskDoubler application will copy fine. Files expanded in this manner
won't automatically re-compress immediately after being closed, but they
will re-compress automatically when they fall under the set AD scheduled
compression time.
-DiskDoubler Expand (a freeware expander included with the Norton Disk
Doubler Pro program) continues to function under OS8 and can expand
files compressed with AutoDoubler or DiskDoubler (including archives or
.sea files).
-The DiskDoubler application can still create .sea or archive files but
you must run DiskDoubler manually rather then rely on the DD Finder menu
extension (as mentioned above).

--
Sincerely,
========================================================================

Scott Crawford-Edgington [Symantec Corporation]
Macintosh Technical Support

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========================================================================

[Marjorie]

Scott, I had read about the verify/repair "fix" before posting my
question and it does not work for me - do you have any other
suggestions on how to recover these files? Thank you, Marjorie

[Scott Crawford-Edgington]

Marjorie wrote:

Hello Marjorie,

If the two workarounds I posted do not work for you, unfortunately, the
files is so corrupted that it will no long uncompress.

[Marjorie]

Scott, what I do not understand is how they became corrupted. Please
refer back to my first note about System 8 - what could have caused
the corruption? I was wondering if there was another option to the
turning off the machine during the verify - I am really uncomfortable
doing that to my machine. Also, evey with a "healthy" dd file, I
can't seem to get the timing right for turning off the machine-in
other words, I have not been able to get the "rescued items" - any
insight? Thank you, Marjorie