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System-Partition >7,8GB (it works!)

By thomas.winkler ·
First I could'nt believe it:
My NT 4.0 SP5 runs on a 13 GB-Partition (Yes only one Partition!)
I formatted the 13GB-Drive in another Machine with NTFS. Then I put the Drive in my old Machine together with a Drive on which I had an Ghost-Image ofmy old Installation. I applied this Image to the 13 GB-Partition and then took out the Drive with the Ghost-Image. And finally I rebooted the Machine. At this point I was sure the Machine of course cannot boot because the System-Partition is greaterthen 7,8 GB, but it works. NT booted and I started Harddisk-Manager to see if this Partition was really 13 GB: and it was.
Now, can anyone explain to me, why this works, altough Microsoft says in Knowledge Base it cannot work ????

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System-Partition >7,8GB (it works!)

by Andy_P In reply to System-Partition >7,8GB ( ...

Thomas

The Boot Sector code must be able to find NTLDR and file system data structures
such as the root directory, the File Allocation Table (FAT) in the case of an
MS-DOS FAT volume or the Master File Table in the case of an NTFS volume. These
must be present within the area of the disk addressable by the 24-bit side,
cylinder, sector structure used by the BIOS INT 13 interface and the partition
table. This limits the size of the system partition to 7.8 gigabytes regardless
of which file system is used.

Found in Q114841

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System-Partition >7,8GB (it works!)

by thomas.winkler In reply to System-Partition >7,8GB ( ...

The question was auto-closed by TechRepublic

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System-Partition >7,8GB (it works!)

by Gicu Artistu' In reply to System-Partition >7,8GB ( ...

When you first install the system the limit that you have is 8.4GB (when NT4.0 Service Pack 1 was released almost all BIOS'es had this limit). But when you try to make the system partition 8.4GB at install you can't because of a liitle flaw (MS substracts the amounts of the NTFS tables from 8.4 and you get 7.8GB.) Of course if you formated the disk on a machine with SP3 no problem. When you copied the image you copied also the NTFS tables so when you booted the NTloader is starting the NTFS andreads the tables. The tables were good because when you copied the image the tables made at format time were correct updated. This works in the way you did it not viceversa.

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System-Partition >7,8GB (it works!)

by thomas.winkler In reply to System-Partition >7,8GB ( ...

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System-Partition >7,8GB (it works!)

by Gicu Artistu' In reply to System-Partition >7,8GB ( ...

Correction...
When you formated the disk you created the NTFS tables. When you copied the image you didn't create another tables you just updated the ones there (and those were for 13GB).

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System-Partition >7,8GB (it works!)

by thomas.winkler In reply to System-Partition >7,8GB ( ...

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System-Partition >7,8GB (it works!)

by powerstroke In reply to System-Partition >7,8GB ( ...

I belive this has more to do with the ghost image as the image puts files I belive on the new drive the same as the image starting from a zero point the files that NT needs were within the 7.8GB that it can read on boot.

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System-Partition >7,8GB (it works!)

by thomas.winkler In reply to System-Partition >7,8GB ( ...

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System-Partition >7,8GB (it works!)

by rotocron In reply to System-Partition >7,8GB ( ...

I have yet to read the specific article numbers that are flying around here, but you basically did a workaround (believe me, it's not the first or the last thing that works, that MS says will not). The main reason for the 4g limit at setup time is because as we all know, it run a text based program and I believe it originally boots with the FAT16 file system (it definatelly can't boot NTFS yet and if you notice, even when you choose "format with NTFS" during the text setup, it runs through thesetup and then the first time the machine reboots, it does a convert before continuing with the gui part of the setup). The only other way to do a large system disk (without going through the trouble of ghosting), is to use the "expand oem partition" only available in the setup script. You can't even expand the system partition ("expand volume set") in Disk Administrator because it can't touch the partion it's running from.

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System-Partition >7,8GB (it works!)

by thomas.winkler In reply to System-Partition >7,8GB ( ...

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