i currently have the iflash quad It corrupts unless i use disk mode
Yeah, I got that - but personally I prefer the iflash quad to an ssd - used to have the SSD but it was too prone to corrupt itself, whereas the sd card mod works perfectly well for me, as long as I use disk mode to sync (which I don't find to be a problem).
Hence the suggestion that you could try the 240gb hdd (I still have an ipod with that drive, predates the flash mods) and avoid the problems of both sd and ssd mods, if you want something that "just works".
Others seem to have found native zif ssds to be less problematic than adaptor-based ones, don't know if anyone is still around on here to give advice.