<p>I realize this is really old, but since Nikon hasn't (arguably) made an update to this camera since then, and since people may use a search engine and find this thread (such as me), I wanted to add some useful information:<br>
In short, the D300S *can* use an SD card with capacity greater than 32GB (that is, it can use an SDXC card). The real limitation for the D300S isn't SDHC, it is the file format which must be FAT32. I am for example right now using on my D300S a SanDisk Extreme 128GB (Class 10 U1 45 MB/s, SDXC I), formatted FAT32, 128GB, with several thousands of RAW pictures stored on it (and backed up!).<br>
You can format the card on the D300S (it was shipped exFAT format), however it will format it FAT32 and limit the capacity to 55GB (if I recall-- it's been awhile). To get the full capacity, you must format it another way. Unfortunately many formatting tools (such as Windows) will not format a card > 32GB in FAT32 (it will format exFAT, which D300S doesn't understand). To allow the D300S to access the additional memory you must format the card with a 3rd party tool that will format the card FAT32. One example is at this link:<br>
http://www.ridgecrop.demon.co.uk/index.htm?guiformat.htm<br>
Enjoy your new capacity!<br>
K</p>
