Re: Low level diskette I/O in Swiftforth

Ceballos Cabrillo, Federico de wrote:

>>I have a corrupt 3.5" single density diskette.
>>I wish to retrieve as much data as possible from it.
>>I have enough prior knowledge of contents that reading individual
>>sectors would be useful.
>>Is there anyway in SwiftForth to do reads of specific sectors?
>
>
> There has been several replies to this post, but so far no-one has
> answer the question. ;-)
>
> YES, it is possible to read specific sectors in SwiftForth. The
> easiest way is to read the whole disk at once, with code similar to
> this:
>
> 1440 1024 * CONSTANT SIZE
> SIZE BUFFER: DATA
> S" \\.\A:" R/O OPEN-FILE THROW
> ( fid ) DATA SIZE THIRD READ-FILE THROW SIZE <> THROW
> ( fid ) CLOSE-FILE THROW
>
> After it runs, you will have the contents of a high-density flopply
> in A: stored at DATA.
>
> According to the documentation, you need Windows NT and you must
> have administrative privileges.
>
> Regards,
> Federico de Ceballos
>

I'm hesitant to use this as it seems to presume all sectors are *readable*.

When I said directory and FAT can be assumed to have been
*TRASHED*

I did not mean they had erroneous information ;{

I'm looking for a scheme to read explicitly specified physical sector(s).

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Received on Mon Feb 14 2005 - 10:59:33 PST