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Himem.sys Address line A20 already enabled

Posted on 2004-07-30
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Last Modified: 2008-01-09
I'm having a lot of noise and vibration from my newly installed hard drive.  I changed out an old HD for this one.  I ran HD Tech and Maxblast, the utility that came with my Maxtor HD.  The hard drive passes all tests.  Interestingly, I don't get the noise and vibration when running utilities, only when running from Win XP Pro during normal use.

When running Maxblast, I got an error message "Himem.sys Warning: Address line A20 already enabled."  This is not a popup warning, but almost appears to be a standard message.  Can't find any explanation on Maxtor's site or on the web.   What does this mean?  Can it be related to my problems?

I'm having such severe crashes that I'm going to have to reformat and reinstall everything, I'm afraid, but there is something wrong with how this hard drive is interfacing and functioning.  There's no point in doing that until I have this problem diagnosed.    At this point, the system has "serious errors" when running almost anything.  I've tried going to different restore points, but that only makes the problem worse and Windows becomes inaccessible.

BTW, I'm running NAV, Zone Alarm, Ad Aware and another web bot removal tool, and everything seems fine.  I can't run anything at this point, and Windows XP Pro is hanging my a thread.  So this is not a virus problem.

When I installed the new HD, I simply changed the parts, using the same Ulta ribbon connector and power connector.  Cmos had no problem identifying the new HD.  Should I have done something more?

Also, there's more HD space being taken up than I believe there should be.  Since the HD seems to be working double-time, is it possible that it's hyperthreading onto one HD only?  It almost feels like that.  I don't have RAID 0 enabled...can't recall the details, but since I have no second HD, I'm not set up for hyperthreading.

Also, Bios does not have "32 bit data transfer" enabled.  Should it be?

Thanks.  I'm getting desperate.
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Question by:turet
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Callandor earned 500 total points
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Himem.sys and address line A20 are relics from Windows 3.1 and unneeded .  Do you have a config.sys file with this somewhere?

If your BIOS correctly identifies the hard drive, you don't need to do anything, except you might want to make sure the drive is in UDMA mode, as opposed to PIO mode.

What does hyperthreading have to do with your hard drive?  That's strictly a cpu feature, and doesn't affect it.
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