Manual browser: umass(4)

UMASS(4) Kernel Interfaces Manual UMASS(4)


umassUSB mass storage support


umass* at uhub?
atapibus* at umass?
scsibus* at umass? channel ?
wd* at umass?


The umass driver provides support for USB mass storage class devices. The driver supports subclasses SCSI, 8020i (ATAPI), 8070i (ATAPI), QIC157 (ATAPI), RBC (subset of SCSI), and UFI (USB Floppy). The driver handles the protocols Bulk-Only, CBI, and CBI-with-CCI.


Devices known to work with this driver include:

Creative Tech NOMAD MuVo TX
FujiFilm FinePix1300 Digital Camera
Imation SuperDisk
IOmega Zip 100
IOmega Zip 250
Kingston DataTraveler 2.0
LaCie CD R/W
Lexar Media JumpDrive Flash Disks
Neodio Multi-format Flash Controller
Olympus C-5050 ZOOM Digital Camera
SanDisk ImageMate SDDR-31
Siemens MP3-Player USB
Sony DSC Digital Cameras
STMicroelectronics ST92163 Mass Storage library Tester
Y-E Data FlashBuster floppy

The driver also supports certain adapters from In-System Design that use the (non-standardized) ATA protocol over Bulk-Only.


The umass driver is a port of the FreeBSD driver. The umass driver appeared in NetBSD 1.5.
June 26, 2005 NetBSD 7.0