PS2 HDD and HD Advance wants to format on every restart

[B11TME]

Hi there i am pretty new to useing the ps2 hdd. This is what i have got. I have a Maxtor 40gig hdd and its in the supported list and i have the network adapter and i have HD Advance 2.1. Now what happens is HD Advance picks up the hdd and tell me it needs formated so i click ok and it takes about 5 secs to finish. After that it lets me into the menue were i can convert games to the hdd with no problems at all but when i try and run them right after i have finished putting it on the hdd it just comes up with a blank screen. When i restart the ps2 it asks me to format my hdd again and even if i dont install games onto it and format then restart it still asks me to format. I have tried useing WinHIIP to install and format the drive and when i open the hdd up in WinHIIP it says there was problems with the drive setup. I let WinHIIP format and setup the drive and all was good untill i put it back into the ps2 and it asked me again to format the hdd. I have also tried loading games on from WinHIIP but still wants to format no matter what i do. I really hope some one can help me. Oh and by the way hi everyone i am new to the forum and i would just like to say nice job all. Regards