A device instance ID is a system-supplied device identification string that uniquely identifies a device in the system. The Plug and Play (PnP) manager assigns a device instance ID to each device node (devnode) in a system's device tree.

The format of this string consists of an instance ID concatenated to a device ID, as follows:

\

The number of characters of a device instance ID, excluding a NULL-terminator, must be less than MAX_DEVICE_ID_LEN. This constraint applies to the sum of the lengths of all the fields and "\" field separator between the device ID and instance-specific-ID fields.

A device instance ID is persistent across system restarts.

The following is an example of an instance ID ("1&08") concatenated to a device ID for a PCI device:

PCI\VEN_1000&DEV_0001&SUBSYS_00000000&REV_02\1&08

译文：

设备实例ID是系统提供的设备标识字符串，用于唯一标识系统中的设备。即插即用（PnP）管理器将设备实例ID分配给系统设备树中的每个设备节点（devnode）。

该字符串的格式由连接到设备ID的实例ID组成，如下所示：

\

设备实例ID的字符数（不包括空终止符）必须小于MAX_DEVICE_ID_LEN。此限制适用于设备ID和实例特定ID字段之间的所有字段长度和“\”字段分隔符的总和。

设备实例ID在系统重新启动时保持不变。

以下是连接到PCI设备的设备ID的实例ID（“1＆08”）的示例：

PCI\VEN_1000&DEV_0001&SUBSYS_00000000&REV_02\1&08