I can confirm the behaviour 'bruce_lee_' is talking about.
I even recognized it in earlier versions, so this is not a recent bug introduced in the very newest versions (beside that, 564 is the last compiled rev. I have...).
I'm sorry that I wasn't the one which posted a report about it, since I already recognized it somewhen...
Atleast I can confirm it...
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