Actually, this seems to be a problem cropping up with some 'cheaper' made sticks and 3.30/3.40OE. I have three Memory Sticks, and two of my own PSP's
One PSP is running 3.40OE-A and the other is running 3.10OE-A' for popsloader support.
The PSP with 3.40OE-A used to read all three of my Memory Sticks just fine in 3.03OE-C and 3.10OE-A. The only difference used to be speed, with Sandisk being the fastest, Genuine Sony coming in slightly behind, and my Lexar stick being slightly noticeably slower.
Currently the 3.40OE-A PSP will only read my Sandisk and my Genuine Sony sticks.
The 3.10OE-A' PSP can still read all of the memory sticks. Moral of the story? Try going back to 3.10OE-A' and emulate 3.40 with devhook if you need the latest firmware.
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