Comment 127 for bug 925760

As Ralf Corsepius already mentioned, this is still happening in Fedora 21, although with a new error message:

len# modprobe ums-realtek
Jul 29 11:06:01 len kernel: ums-realtek 1-5:1.0: USB Mass Storage device detected
Jul 29 11:06:01 len kernel: scsi host4: usb-storage 1-5:1.0
Jul 29 11:06:01 len kernel: usbcore: registered new interface driver ums-realtek
Jul 29 11:06:02 len kernel: scsi 4:0:0:0: Direct-Access Generic- Multi-Card 1.00 PQ: 0 ANSI: 0 CCS
Jul 29 11:06:02 len kernel: sd 4:0:0:0: [sdb] Attached SCSI removable disk
Jul 29 11:06:02 len kernel: sd 4:0:0:0: Attached scsi generic sg1 type 0
Jul 29 11:06:02 len systemd-udevd[251]: error: /dev/sdb: No medium found
Jul 29 11:06:03 len systemd-udevd[251]: error: /dev/sdb: No medium found

=== And then, every 50 seconds:

Jul 29 11:06:52 len systemd-udevd[251]: error: /dev/sdb: No medium found
Jul 29 11:06:53 len systemd-udevd[251]: error: /dev/sdb: No medium found
Jul 29 11:06:53 len systemd-udevd[251]: error: /dev/sdb: No medium found

Jul 29 11:07:44 len systemd-udevd[251]: error: /dev/sdb: No medium found
Jul 29 11:07:44 len systemd-udevd[251]: error: /dev/sdb: No medium found
Jul 29 11:07:44 len systemd-udevd[251]: error: /dev/sdb: No medium found

Unloading (and blacklisting) ums_realtek make the error go away.