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miguell1

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Error -127: unable to access hard drive

I have a hard drive that allows me to initialize it and load system 8.0 on it.  I can boot from it, and use all teh software in it.  Then, after a while (could be minutes, or days) it gives me an error type -127 with an unable to access message.  Don't know what triggers it, have another 3 drives, all working fine.  came loaded with system 7.6.  is a 540 MB IBM HD, with the Apple logo.  Apple utilities software shows the HD not mounted.
     I would like to know what is going on, and if there is a way to take care of this problem.
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weed
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first of all what hardware are you running it on? performa? 6500? did you update the HD drivers with drive setup 1.3.1?
The boot block on the hard drive is damaged and you should back up your data and replace the drive.
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miguell1

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If the boot block is bad, then how come it doesn't find the bad blocks, and marks then as such when I do a hard drive test and initialize the hard drive with the "zero all data" option?  It should not use those bad blocks when I reformat the hard drive
more info:  I am using a PowerMac 6100/60, and the software utilities are the ones included in the System 8.0 CD
you are quite correct...the blocks are fine and any bad ones have been sectored out..have you checked the connections to your drive?..are they all tight? have you run techtool on it? is there ANY pattern?...does the error occur when you bump the drive or stomp heavily on the floor? is it only with certain applications running?
As "Weed" confirmed, it doesn't look like the problem is with a bad boot block.  I will open up the case and make sure all the cables are tight.  As a matter of fact, I will replace the cables.
Also, the problem happens at intermittent intervals, one time it happened as it was booting up, another time while I booted up from another hard drive and was not using the bad hard drive at all.  I started getting the error messages repeatedly.
where can I find a copy of "techtool"?
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I thank everybody for their answers.  I think TheHub finally hit the nail on the head.