Here you will find links to upgrade your PMD570 Compact Flash recorder so it will accept CF cards greater than 8MB.
As these are OLD instructions, I cannot verify they will work and you must understand this could render your machine unusable.
Disclaimer: Download these files at your own risk. I do not claim any responsibility for any damage or equipment rendered inoperable. The files are provided as is. The procedures worked for me, but results may vary.