Some can't prepare past 127GB as noted at http://www.48bitlba.com
I had a 250gb maxtor external drive that stopped working right after my warranty expired. I found a 250 western digital hard drive to replace the junked drive in the maxtor. When my Mac sees it - it still shows up as: maxtor 128 drive, saying that there is only 128gb available. I have tried reformatting it, but that doesn't seem to work. Any ideas?