System Administration Guide: Devices and File Systems

USB 2.0 Features

The following USB 2.0 features are included:

For a description of USB devices and terminology, see Overview of USB Devices.

USB 2.0 Device Features and Compatibility Issues

USB 2.0 devices are defined as high-speed devices that follow the USB 2.0 specification. You can refer to the USB 2.0 specification at

To identify the speed of your USB device in the Solaris 10 releases, check the /var/adm/messages file for messages similar to the following:

Dec 13 17:05:57 mysystem usba: [ID 912658] USB 2.0 device
(usb50d,249) operating at hi speed (USB 2.x) on USB 2.0 external hub:
storage@4, scsa2usb0 at bus address 4

Here are some of the USB devices that are supported in this Solaris release:

For a full listing of USB devices that have been verified on the Solaris release, go to:

Additional storage devices might work by modifying the scsa2usb.conf file. For more information, see scsa2usb(7D).

Solaris USB 2.0 device support includes the following features:

For more information on USB 2.0 device support, see ehci(7D) and usba(7D).

Bus-Powered Devices

Bus-powered hubs use power from the USB bus to which they are connected, to power devices connected to them. Special care must be taken to not overload these hubs, because the power these hubs offer to their downstream devices is limited.

Starting in the Solaris Express release, power budgeting is implemented for USB devices. This feature has the following limitations: