После обновления ядра до 2.6.15 нет /dev/sda

при втыкании usb-диска типа flash или usb-floppy.

dmesg пишет:
scsi5 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 4
usb-storage: waiting for device to settle before scanning
Vendor: MITSUMI Model: USB FDD Rev: 1039
Type: Direct-Access ANSI SCSI revision: 00
SCSI device sda: 2880 512-byte hdwr sectors (1 MB)
sda: Write Protect is off
sda: Mode Sense: 00 46 94 00
sda: assuming drive cache: write through
SCSI device sda: 2880 512-byte hdwr sectors (1 MB)
sda: Write Protect is off
sda: Mode Sense: 00 46 94 00
sda: assuming drive cache: write through
sda: unknown partition table
sd 5:0:0:0: Attached scsi removable disk sda
sd 5:0:0:0: Attached scsi generic sg0 type 0
usb-storage: device scan complete

Типа всё нормально, а /dev/sda нет. Что делать?