Adata 300 32GB & 2007 Macbook - Disk Doesn't Show in DU

[Mac]

Hi, December last year I had two 2.5" HDD's fail, the original Seagate and a replacement Toshiba. I sent the first to a data recovery company, who told me the plate damage was so bad there was no chance of recovery. I didn't bother sending the second, but as the noises were the same I assume...