dmesg の内容) umass0: Generic 6-IN-1, rev 1.10/0.12, addr 2 umass0: at uhub0 port 1 (addr 2) disconnected umass0: detached umass0: Generic 6-IN-1, rev 1.10/0.12, addr 2 da0 at umass-sim0 bus 0 target 0 lun 0 da0: Removable Direct Access SCSI-0 device da0: 1.000MB/s transfers da0: 31MB (63488 512 byte sectors: 0H 0S/T 0C) umass0: at uhub0 port 1 (addr 2) disconnected (da0:umass-sim0:0:0:0): lost device (da0:umass-sim0:0:0:0): removing device entry umass0: detached usbdevs -v の結果) addr 1: full speed, self powered, config 1, OHCI root hub(0x0000), AcerLabs(0x0000), rev 1.00 port 1 addr 2: full speed, power 100 mA, config 1, product 0x3209(0x3209), vendor 0x2632(0x2632), rev 0.12 port 2 powered