usb mass storage driver for windows 2000

R(4) is a 4-character revision level value. T* is a SCSI device type code of variable length. The hardware IDs that the USB storage port driver generates are as follows: R(4) is a 4-character revision level value.Īn example of a device ID for a disk drive would be as follows: P(16) is a 16-character product identifier. V(8) is an 8-character vendor identifier. When the PnP manager queries for the device identification strings of the newly created PDOs, the USB storage port driver creates a new set of device, hardware and compatible IDs derived from the device's SCSI inquiry data. For more information, see the example device stack created by Usbstor.sys illustrated in Device Object Example for a USB Mass Storage Device. If the data retrieved from the device's device descriptor matches any of these compatible IDs, the operating system will load Usbstor.sys.Īs soon as it is loaded, the USB storage port driver creates a new PDO for each of the device's logical units. Protocol 50h = the bulk-only transport protocol. Subclass 05h = SFF-8070i ATAPI removable media. Subclass 02h = SFF-8020i ATAPI CD-ROM devices. In addition to these device IDs, Usbstor.inf contains compatible IDs for class 8 ATAPI CD-ROM and removable media devices that support bulk-only transport: V(4) is the 4-digit vendor code that the USB committee assigns to the vendor.ĭ(4) is the 4-digit product code that the vendor assigns to the device. The device IDs for USB mass storage devices in Usbstor.inf take the usual form for USB device IDs composed by using information in the USB device's device descriptor:

If the USB hub driver enumerates one of these devices, the operating system will automatically load the USB storage port driver, Usbstor.sys.

The Usbstor.inf installation file contains device IDs for those devices that are explicitly supported. Starting with Windows 2000, the operating system provides native support for many USB mass storage devices.

Usb mass storage driver for windows 2000