Disconnect then reconnect:
usb 2-1: USB disconnect, address 9
usb 2-1: new full speed USB device using uhci_hcd and address 10
usb 2-1: configuration #1 chosen from 1 choice
scsi8 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 10
usb-storage: waiting for device to settle before scanning
scsi9 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 10
usb-storage: waiting for device to settle before scanning
usb-storage: device scan complete
usb-storage: device scan complete
scsi 8:0:0:0: Direct-Access SEMC Int.Memory 0000 PQ: 0 ANSI: 0
scsi 9:0:0:0: Direct-Access SEMC Mem-Stick 0000 PQ: 0 ANSI: 0
sd 8:0:0:0: Attached scsi removable disk sdb
sd 8:0:0:0: Attached scsi generic sg2 type 0
sd 9:0:0:0: Attached scsi removable disk sdc
sd 9:0:0:0: Attached scsi generic sg3 type 0
disconnect then reconnect:
usb 2-1: USB disconnect, address 11
usb 2-1: new full speed USB device using uhci_hcd and address 12
usb 2-1: configuration #1 chosen from 1 choice
scsi10 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 12
usb-storage: waiting for device to settle before scanning
scsi11 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 12
usb-storage: waiting for device to settle before scanning
usb-storage: device scan complete
usb-storage: device scan complete
scsi 10:0:0:0: Direct-Access SEMC Int.Memory 0000 PQ: 0 ANSI: 0
scsi 11:0:0:0: Direct-Access SEMC Mem-Stick 0000 PQ: 0 ANSI: 0
sd 10:0:0:0: Attached scsi removable disk sdb
sd 10:0:0:0: Attached scsi generic sg2 type 0
sd 11:0:0:0: Attached scsi removable disk sdc
sd 11:0:0:0: Attached scsi generic sg3 type 0