![]() ![]() To use the exclusive access mechanism, applications must send an IOCTL_CDROM_EXCLUSIVE_ACCESS request to the CD-ROM class driver at PASSIVE_LEVEL IRQL. You should not use filter drivers to obtain exclusive access to CD-ROM devices. Without the exclusive access mechanism, the only way for vendors to give these two types of applications exclusive access would be to install a custom filter driver that fails I/O requests from other applications and components, and this approach causes system instability. If an application sends a command to the device during a firmware update, it might make the device unusable. Many manufacturers of CD-ROM devices provide a firmware update utility. Otherwise, data might be written incorrectly, causing data corruption. ![]() Some optical authoring software requires exclusive access to a CD-ROM device to write data without any interruption from other applications. Applications that require exclusive access to CD-ROM devices include the following examples: The CD-ROM exclusive access mechanism (also known as exclusive access mode) enables applications and system components to obtain exclusive access to a CD-ROM device. ![]()
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