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Windows NT 4.0 Winbond Super I/O Floppy Disk Controller May Not Report Data Underrun or Overrun Condition Correctly (Q300987)

The information in this article applies to:

  • Microsoft Windows NT Workstation versions 4.0 , 4.0 SP1 , 4.0 SP2 , 4.0 SP3 , 4.0 SP4 , 4.0 SP5 , 4.0 SP6a
  • Microsoft Windows NT Server versions 4.0 , 4.0 SP1 , 4.0 SP2 , 4.0 SP3 , 4.0 SP4 , 4.0 SP5 , 4.0 SP6a


Under a heavy system load, access to a floppy disk drive may result in the following error message:

System Process - No Disk
There is no disk in the drive. Please insert a disk into drive A.
This error message has occurred during testing of a third-party system using a Winbond Super I/O floppy disk controller. This issue has not been reported during use, only during testing.


This issue occurs because the Winbond Super I/O controller does not report the data underrun or overrun condition correctly.


A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem.

To resolve this problem immediately, download the fix as instructed below or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
NOTE : In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The following file is available for download from the Microsoft Download Center:
] Download Q300987i.exe now
Release Date: September 21, 2001

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:
Q119591 How to Obtain Microsoft Support Files from Online Services
Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

The English version of this update should have the following file attributes or later:
   Date         Time   Size    File name   Platform
   12-Jun-2001  16:40  18,928  Floppy.sys  Intel
   12-Jun-2001  16:36  30,960  Floppy.sys  Alpha  
NOTE : Because of file dependencies, this update requires Microsoft Windows NT 4.0 Service Pack 6a.


Microsoft has confirmed this problem only under certain conditions during third-party testing, not during use.

Published Jul 27 2001 3:32AM Issue Type kbbug
Last Modifed Sep 21 2001 11:35AM Additional Query Words
Keywords kbWinNT400PreSP7Fix


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