Do a search for Raw write/read you can clone the flash drives including
PCMCIA Flash Disk


"Peter" wrote in message
...

"Travis Marlatte" wrote

so that the PC software can write to it in a simple manner. I don't
know what is involved but can tell you that if you plug one of these
into a normal reader and invoke the windoze API call for reading
physical sectors, all you see is rubbish; mostly zeroes. It looks like
they are using some odd property of the flash chips, but that would
lead to rapid obsolescence.

No odd property of the flash chip at all. Just a low level data structure
that makes no sense to the Windows drivers trying to interpret it as a
device that supports a filesystem.

It is entirely feasible to write a Windows driver for a Jepp datacard. You
would bypass all of the Windows drivers and be writing a very low level
device interface.

I'm just glad they still support data updates at all. Pay the $150 and
enjoy
the updated data in your GX55.

No matter what the filing system is, one should still be able to read
*logical sectors* from a CF using any cheap CF reader.

AFAIK the reader just returns logical sectors - the file structure is
down to the O/S.

If you read a KLN94 CF cartridge (an old 48MB Sandisk part; they must
have bought loads of them) in this way, you get mostly zeroes, plus a
very small amount of rubbish which doesn't seem to be valid data and
there is nowhere near enough of it for the size of the database (about
2MB). Hence my comment that they are invoking some flash chip feature.