1. Don't use the 'Power defragmenter', but Auslogic's tool instead!
2. If you can, try to use a OPL-revision which is known to be working...
Btw.: Are you sure you didn't changed ANYTHING at all?
What about your PS3s FW? Did you update it in-between?
PS2 V7/DMS3 V2 (FW:2.4b7); Seagate Baracuda 200GB
PS2 V7/CC1.0 (FW:34 hacked v2 BM:2.1.6); Maxtor DiamondMAX9 PLUS 160GB
PS2 SCPH-30004R; NoMod+NoLaser
3xSony MC 8MB
MAX/Datel 16MB with Boot-CD
Custom FMCB 1.8b+ Beta-Build, my AIO 0.5, Sony&xRhino-Linux