Hi, There are several possibilities.
1. NT4, on an initial install, will ONLY allow the maximum size of the system partition to be 4 gig. During the install, you select the 4 gig size, it is formated into FAT. If you wanted the drive to be NTFS,after a reboot, the drive would be converted.
2. If you choose the above option, after the install, and after applying SP4 (or higher), you can open the Disk Administrator, and then format the remainder of the hard drive. If you choose NTFS, the size can be almost any size you choose. Please keep in mind, that you can create up to a maximum of 4 Primary partitions. Your system partition is the first Primary. You can add up to 3 additional partitions. Or you can choose to create an Extended partition. Then Within the Extended partition, you can create as many additional Virtural partitions as you desire. An Extended partition takes the place of one Primary partition.
3. There is another possibility, but it will take another system. Ifyou have another NT4 system, take the 75Gig drive from the new computer and slave it to the other NT4 computer. Once the drive is recognized, you can create your first Primary partition as an NTFS volume. You can make it any size you desire. For example you choose to make it 20 Gig. Once it is formatted, you shut down the NT4 computer, remove the 75 Gig drive and put it back into the new system. Now, when you attempt to install your NT4 operating system, it will find the NTFS volume and place the installation there. This is a way around the limitations that NT4 makes on an initial install.
The maximimum size of a FAT partition is 4 Gig. Windows NT only uses 3 types of file systems, FAT, NTFS and CDFS.
It is IMPOSSIBLE to create a FAT16 greater than 4 gig on an NT4 computer.
If the partition is NTFS, and you share the drive on the network, it will be available for others to use.