This article was previously published under Q152517
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If you have Windows NT installed on the first primary partition formattedas NTFS, and you chose to reformat the partition as NTFS during Setup tostart with a clean partition, the Windows NT setup program will reformatthe partition as FAT, copy files from the CD-ROM, and then try to rebootthe computer in GUI mode to continue the installation.At this point the computer will either stop responding or display thefollowing error message:
DISK READ ERROR OCCURED.
If you boot from an MS-DOS disk and run scandisk C: you will encounter thefollowing:
The media descriptor byte is invalid. FAT copies are not the same. Many crosslinked files. All directory entries were invalid.
Trying to repair the partition does not resolve the corruption, nor does itallow the installation to resume.
Windows NT always reformats the partition you want to install on using theFAT file system, then performs a conversion to NTFS on the final re-bootafter Windows NT is finished setting up. When you choose to reformat thesystem boot partition as NTFS, Setup is inadvertently writing the 16 sectorNTFS boot area over the top of the freshly formatted FAT drive after thefile copying portion of text mode setup is complete.
During Setup, choose to delete the Primary NTFS Boot partition , then re-create the partition and choose to format it NTFS.
Select the FAT file system to set up Windows NT on. After Windows NT is set up, perform a manual conversion to NTFS as follows:
convert c: /fs:ntfs
Microsoft has confirmed this to be a problem in Windows NT versions 3.50and 3.51 We are researching this problem and will post new information herein the Microsoft Knowledge Base as it becomes available.