win95, nt4, w2k booting problem

I have installed onto a 6gig HD win95, nt4 and w2k.  Win95 first on primary 16bit fat <2gig, followed by Nt4 NTFS on 2gig partition, last followed by w2k using its NTFS on the balance of drive.  Was able to boot to win95 or nt4 using nt4's boot menu.  After w2k went in still can boot to 95 and to w2k but not to NT4.  Boot.ini looks fine but when system comes up to first blue screen I get an Stop: 0x0000007b inaccessible_boot_device error.  Whats up here..
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jmatwykoAsked:
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fjonckersCommented:
the installation of W2K made a copy of the NT4 boot sector in one of its folders.
When you select NT4, the boot loader tries to load/start the NT4 boot image - but it's located above 2gb - which is
not supported by the NT4 boot software

Best that you try to stay under the 2gb limit ... (even with W2K)

Filip
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jmatwykoAuthor Commented:
I corrected the problem reinstalling the NT4 onto the same partition (reformatted it during the install again).  All now boot correctly.  Although with this latest install I formatted the partition using FAT.  So I guess will see what happens when I convert to NTFS.  I am not sure what you mean by exceeding a 2gig limit as I currently install all workstations or servers to just under 4gig and then extend partition to whatever size is needed with PQmagic.  Do you mean that the system partition cannot exceed 2gig, which is where the boot files are located?
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fjonckersCommented:
The 2 Gb restriction is hardware based
The boot sector/file must be located
under the 2 Gb limit
(hardware controller or BIOS limit the bootsector under cylinder 1024 - see also MS K.B. article 98080)
(This has nothing to do with Windows - even Linux has the same problem ...)

Your Primary partition can be larger than 2 Gb - as long as the first file loaded is located below 2 Gb

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fichmanCommented:
Win2K uses NTFS 5.0 which is different than the one normaly used by NT 4.0.
Support has been added for NTFS 5 to SP4 and up for NT4.
To make NT 4.0 access NTFS 5.0, you need to install SP4 or higher.

alexf
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fichmanCommented:
another thing,
The boot process is limited to the first 1024 cylinders, but the OS is not.
after the NT kernel is loaded it bypasses the BIOS when accessing the disks, eliminating the problem. The boot process is dependant on it yet. The problem is the boot process uses 16bit code and 16bit pointers which impose the limit.

alexf
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fjonckersCommented:
just what I said (more or less ..)
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fichmanCommented:
regarding my comment, yes.
what say you about the answer?

alexf
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jmatwykoAuthor Commented:
OK guys that all makes sense but what did w2k do to the NT4 partition that stopped it from loading the NT4 OS.  As it stands the NT4 install was on a 2 gig partition and booted fine until w2k was loaded on the last partition.  I understand why the ntldr and bootsect.dos (etc) files needing to be not necessary on a partition smaller than 2 gig but actually located in the portion of the drive that is under the 2 gig 16bit addressing scheme.  Did w2k actually change something on the NT4 partition??
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fichmanCommented:
Yes. it changed the NTFS format to the new one. NT 4.0 does not understand the new NTFS 5 unless it has SP4 or above.

alexf
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jmatwykoAuthor Commented:
Thanks to both..
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Windows 2000

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