On a Windows Vista-based computer, when you use the Win32_EncryptableVolume Windows Management Instrumentation (WMI) class to check whether drives are encrypted or not, the floppy disk drive lights and the CD drive or DVD drive lights flash unexpectedly during the query process. This issue occurs even when you explicitly specify the drives to query.

Note: The Win32_EncryptableVolume WMI provider class represents an area of storage on a hard disk that can be protected by using BitLocker Drive Encryption. Only NTFS volumes can be encrypted.

Consider the following scenario. Read operations or write operations are performed on a floppy disk that is running on an early Microsoft operating system. Examples of early Microsoft operating systems include the following:

• Microsoft Windows Millennium Edition
• Microsoft Windows 98 Second Edition
• Microsoft Windows 98
• Microsoft Windows 95
• Microsoft Windows 3.1
• MS-DOS

These operations may be performed slightly faster on one of these early Microsoft operating systems than on a newer Microsoft operating system. Examples of newer Microsoft operating systems include the following:

• Windows Vista
• Microsoft Windows Server 2003
• Microsoft Windows XP
• Microsoft Windows 2000
• Microsoft Windows NT

This behavior occurs if you use a floppy disk controller (FDC) that is 100-percent compatible with the original floppy disk controller. In a worst-case scenario, the difference in performance speed may be as much as 16 seconds.