Hi there, I have tried to install a 500 GB Toshiba hard disc into my optical bay via a caddy, however it is slow to the point of being unsuable. I realise this is possibly due to the fact this particular HD requires power. Would I still be able to insert this into the mac to use an an extra drive - does it need a special caddy which will power it? I have pictured it next to another drive (which I may use but has lower capacity). Please let me know if possible.