I have just installed a new UDMA Quantum FB 4.0Gb on my computer, CMOS detected that it was a 4.0Gb hdd and installed it in LBA mode. every thing seemed ok, however it takes me abt 1 min to benchmark the drive with NU98, and the point was only 49 (my old Quantum 2.0Gb no UDMA, got more than 50 with a very short benchmark time) I don't know what was wrong since the drive work pretty good (except the problem in benchmark). yesterday, i have found that all the information abt my hdd in CMOS are completely different from the number provided on the disk (C=14### - i forgot :),H=9,S=63) . i change the number in CMOS to the number provided be Quantum anh the computer still work , but not boot from hdd,it's like there is nothing on the hdd . I reenter the old number and it works ok again. The two information of the factor and the current informations both are detected by CMOS(the current is i LBA mode and the provided is in NORMAL mode or AUTO mode). I think i have to run fdisk again to use the hdd with new number. Since the hdd is now full of important informations, so it is wiser to make sure if the new number will improve the speed of the drive or not first. and that's what i need help on. Are there any problems using the hdd with informations differ from the informations provided by the factory (slower...)? My computer is e PentiumII 233Mhz, BIOS from Award (maindboard PC Partner), BIOS date is 04/16/98 All comments are appreciated Thank you in advance. Luan Nguyen PCBUILD maintains many useful files for download on our web site - visit our download page at: http://nospin.com/pc/files.html