Hi Jean, Yes, you can get a 128 mb SD card if you want. That's what I used for my upgrade. Johnathan said a 64 mb card would work also but I decided to go for the 128 just in case future upgrades were larger than 64 mb. Others have said that sandisk and I believe Kingston are probably best to go with.
You might be surprised and decide to use your SD card for storage too. I leave my 1 gb SD card in the unit. I sure hope the patch fixes your problem with saving. I'm wondering if the reset test that we did is a true indication of what happens, like maybe a true freeze also does something to erase portions of the file saved with the s chord which doesn't happen when the unit is reset? Good luck. Pam
