Flashed BIOS Maxtor HD not working at full speed

RC159

Senior member
Sep 27, 2000
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Had to upgrade bios because Athlon 750 was not running at full speed. Upgrading bios fixed the cpu problem. Was getting good hard drive bencmarks in Sandra (2200) before bios upgrade. Now getting scores around 750. I have the new VIA 4n1's installed. Also when I enable DMA on hard drive and reboot, my hard drive does not show up in device manager. I have to uninstall drivers then reinstall and leave DMA off for Win98SE to reconize my HD. I reformatted thinking that would correct the problem, it did'nt. I think that the bios upgrade has caused this problem, but don't have no idea why! I have checked all my setting's in BIOS. If go back to the previos bios then my cpu is slow. There's got to be a way that I can have my system working like its suppose. Can someone please help me out? Here's my system:

Asus K7M mobo (ata 66)
Athlon 750 slot A
Maxtor ata 100 7200rpm HD
Diamond Stealth S540 32 meg PCI video
Creative 52X cdrom
Plextor 12/10/32A cdrw
Win98SE