In the Solaris 9 4/04 release, new and revised USB feature descriptions are provided. See Device Management.
Many USB mass storage devices are supported in the Solaris environment. Some noncompliant USB devices might work. Follow the information that is provided in the /kernel/drv/scsa2usb.conf file to see if a particular device can be supported.
These USB mass storage devices enhancements are new for the SPARC platform in the Solaris 9 release. In the Solaris 9 8/03 Update release, these enhancements are now also available for x86 platforms.
For further information, see the System Administration Guide: Basic Administration.