I can't recommend using an adapter if you are a professional/semi player. Ketron use an industrial PATA SSD drive in their upgrade kits - and this is where it would be best to look. Not all are compatible though, they did use Transcend previously, but not all work correctly and the DISK LED remains illuminated. Kingspec PATA SSD drives dont seem to work properly. I'll try and find the old Transcend part Number.

For the USB updates. Contact your distributor, if you bought them through Ketron UK, they will reinitialise the USB stick free of charge if you send it to them. (Roberts styles for example)