Bill,

Judging by the content of your SD Card in question, it does not seem to contain KNxxxx compatible files.... Doing a search on the filename 'MACPRM.ZIF' does indicate that the card has been used in a 'Zoom' personal recorder which I believe uses Apple Mac file format. ??
So, I'm not surprised that your KN2600 does not read the card. I believe the KNs use the FAT16 file format system so it may be possible to recover the card for use on your KN2600, by formatting on your PC first. Make sure that you choose the FAT (Default) option in the Formatting window and the full format option - not just the Quick Format.

Peter,
There is a bug in the early Operating System of the KN7000, which resulted in incorrect reporting of the percentage of free space available on any SD Card. This was corrected by future updates of the Operating System. However, as you say, if everything else is OK, why bother applying the updates and risk possibly screwing up your instrument - it has been known in the past........ If a blank 2GB card is inserted in the KN700, it reports the full capacity of the card even though it can only address half the capacity......

Audrey,
If the little 'Lock -Unlock' slider is missing on the card, then any reading system will see that card as being locked and therefore safe from being over-written. Some software was supplied on cards, configured in this manner.