strange mass storage

skip2816
I have a very strange problem with usb sticks. When i plug in the first one
a /dev/sda node is createt but never a /dev/sda1 node. The next plugged
device has good chances to get a /dev/sdb1, but its not sure. 
I tryed out this with any different sticks, so I can say this problem is
not specific to a single device.

Here the dmesg from a first plugged device:

usb 1-1.2: new full speed USB device using s3c2410-ohci and address 4
usb 1-1.2: New USB device found, idVendor=16c0, idProduct=0500
usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.2: Product: WETTER INFO BOX 2   
usb 1-1.2: Manufacturer: MOERER
usb 1-1.2: SerialNumber: 0000070904
usb 1-1.2: configuration #1 chosen from 1 choice
scsi0 : SCSI emulation for USB Mass Storage devices
scsi 0:0:0:0: Direct-Access     MOERER   WETTER INFO BOX2 1.00 PQ: 0 ANSI:
0
sd 0:0:0:0: [sda] 1537 512-byte hardware sectors: (786 kB/768 KiB)
sd 0:0:0:0: [sda] Write Protect is on
sd 0:0:0:0: [sda] Assuming drive cache: write through
sd 0:0:0:0: [sda] 1537 512-byte hardware sectors: (786 kB/768 KiB)
sd 0:0:0:0: [sda] Write Protect is on
sd 0:0:0:0: [sda] Assuming drive cache: write through
 sda:<7>usb-storage: queuecommand called
 sda1
sd 0:0:0:0: [sda] Attached SCSI removable disk

.... a little bit later:

[root@FriendlyARM /]# ls -l /dev/sd*
brw-rw----    1 root     root       8,   0 Jan 17 15:26 /dev/sda
brw-------    1 root     root     179,   1 Jan 17  2010 /dev/sdcard

has anyone a idea?