# USB storage

The USBSTOR driver tracks various information about attached USB storage
devices in the key.

```
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\USBSTOR
```

The USBSTOR key contains one or more device keys.

## Device key

The name of the device key is formatted as:

```
<Device Type>&Ven_<Vendor>&Prod_<Product>&Rev_<Revision Number>
```

Note that the number of values in the name is variable.

For example: `Disk&Ven_&Prod_&Rev_0.00` or `Disk&Ven_&Prod_`

The device key contains one or more device instance keys.

## Device instance key

The name of the device instance key is formatted as:

For example: `1002131402536a&0`

Sub keys:

Name | Description
--- | ---
Device Parameters |
LogConf |
Properties |

Values:

Name | Data type | Description
--- | --- | ---
Capabilities | REG_DWORD_LITTLE_ENDIAN |
Class | REG_SZ |
ClassGUID | REG_SZ |
CompatibleIDs | REG_MULTI_SZ |
ConfigFlags | REG_DWORD_LITTLE_ENDIAN |
ContainerID | REG_SZ |
DeviceDesc | REG_SZ |
Driver | REG_SZ |
FriendlyName | REG_SZ | Human readable description of the USB storage device
HardwareID | REG_MULTI_SZ |
Mfg | REG_SZ | Manufacturer information
Service | REG_SZ |

## Device Parameters key

Sub keys:

Name | Description
--- | ---
MediaChangeNotification |
Partmgr |

### Device Parameters\Partmgr key

Values:

Name | Data type | Description
--- | --- | ---
Attributes | REG_DWORD_LITTLE_ENDIAN |
DiskId | REG_SZ | Contains a GUID

## LogConf key

## Properties key

Sub keys:

Name | Description
--- | ---
%GUID% | Property set identifier

### Property set key (Properties\\%GUID%)

Sub keys:

Name | Description
--- | ---
%NUMERIC% | Property identifier

#### Property key (Properties\\%GUID%\\%NUMERIC%)

Sub keys:

Name | Description
--- | ---
%NUMERIC% |

#### Property value key (Properties\\%GUID%\\%NUMERIC%\\%NUMERIC%)

Values:

Name | Data type | Description
--- | --- | ---
Data | REG_BINARY | Value data
Type | REG_BINARY | Value type

Value type:

* 0x0007 value data contains a 32-bit little-endian integer
* 0x0010 value data contains a FILETIME
* 0x0012 value data contains an UTF-16 litte-endian encoded string

### Example

```
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\USBSTOR\Disk&Ven_HP&Prod_v100w&Rev_1024\AA951D0000007252&0\Properties\{540b947e-8b40-45bc-a8a2-6a0b894cbda2}\00000004\00000000

Property set: 540b947e-8b40-45bc-a8a2-6a0b894cbda2 (System.Devices)
Property identifier: 4 (PKEY_Device_BusReportedDeviceDesc)
Type: 0x00000012 (UTF-16 litte-endian encoded string)
Data: "HP v100w USB Device"
```

## External links

* [USB device registry entries](https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-device-specific-registry-settings)
* [Identifiers Generated by USBSTOR.SYS](https://learn.microsoft.com/en-us/windows-hardware/drivers/install/identifiers-generated-by-usbstor-sys)
* [DEVPKEY_Device_InstallDate](https://learn.microsoft.com/en-us/windows-hardware/drivers/install/devpkey-device-installdate)
* [DEVPKEY_Device_FirstInstallDate](https://learn.microsoft.com/en-us/windows-hardware/drivers/install/devpkey-device-firstinstalldate)