Tested it now with my smarthone as a disk drive and an usb stick too - wasn't 
able to reproduce it either. 
Seems like it is the external usb hdd the only thing to behave this way, it is 
a Western Digital "My Passport" drive, FWIW. 

If it is the disk itself behaving incorrectly, then sorry for having
wasted your time. I upload the video anyway.

[...]

I have had a look at dmesg before and after the "safely remove" action:

This is how it has been automounted after being plugged:

[11589.657577] usb 2-1.1: USB disconnect, address 16
[11595.790837] usb 2-1.1: new high speed USB device using ehci_hcd and address 
17
[11596.532849] scsi18 : usb-storage 2-1.1:1.0
[11597.529850] scsi 18:0:0:0: Direct-Access     WD       My Passport 0730 1015 
PQ: 0 ANSI: 6
[11597.530710] scsi 18:0:0:1: Enclosure         WD       SES Device       1015 
PQ: 0 ANSI: 6
[11597.531795] sd 18:0:0:0: Attached scsi generic sg2 type 0
[11597.532129] ses 18:0:0:1: Attached Enclosure device
[11597.532403] ses 18:0:0:1: Attached scsi generic sg3 type 13
[11601.976202] sd 18:0:0:0: [sdb] 1953458176 512-byte logical blocks: (1.00 
TB/931 GiB)
[11601.977162] sd 18:0:0:0: [sdb] Write Protect is off
[11601.977168] sd 18:0:0:0: [sdb] Mode Sense: 47 00 10 08
[11601.978908] sd 18:0:0:0: [sdb] No Caching mode page present
[11601.978913] sd 18:0:0:0: [sdb] Assuming drive cache: write through
[11601.983144] sd 18:0:0:0: [sdb] No Caching mode page present
[11601.983151] sd 18:0:0:0: [sdb] Assuming drive cache: write through
[11601.992038]  sdb: sdb1 sdb2 sdb3
[11601.996446] sd 18:0:0:0: [sdb] No Caching mode page present
[11601.996453] sd 18:0:0:0: [sdb] Assuming drive cache: write through
[11601.996458] sd 18:0:0:0: [sdb] Attached SCSI disk
[11602.868941] EXT4-fs (sdb3): mounted filesystem with ordered data mode. Opts: 
(null)

here the safely remove happens, and then:

[11657.404803] usb 2-1.1: USB disconnect, address 17
[11663.194671] usb 2-1.1: new high speed USB device using ehci_hcd and address 
18
[11663.936516] scsi19 : usb-storage 2-1.1:1.0
[11664.933664] scsi 19:0:0:0: Direct-Access     WD       My Passport 0730 1015 
PQ: 0 ANSI: 6
[11664.934512] scsi 19:0:0:1: Enclosure         WD       SES Device       1015 
PQ: 0 ANSI: 6
[11664.935370] sd 19:0:0:0: Attached scsi generic sg2 type 0
[11664.935600] ses 19:0:0:1: Attached Enclosure device
[11664.935756] ses 19:0:0:1: Attached scsi generic sg3 type 13
[11669.384341] sd 19:0:0:0: [sdb] 1953458176 512-byte logical blocks: (1.00 
TB/931 GiB)
[11669.385351] sd 19:0:0:0: [sdb] Write Protect is off
[11669.385358] sd 19:0:0:0: [sdb] Mode Sense: 47 00 10 08
[11669.386947] sd 19:0:0:0: [sdb] No Caching mode page present
[11669.386952] sd 19:0:0:0: [sdb] Assuming drive cache: write through
[11669.390675] sd 19:0:0:0: [sdb] No Caching mode page present
[11669.390682] sd 19:0:0:0: [sdb] Assuming drive cache: write through
[11669.400333]  sdb: sdb1 sdb2 sdb3
[11669.405671] sd 19:0:0:0: [sdb] No Caching mode page present
[11669.405678] sd 19:0:0:0: [sdb] Assuming drive cache: write through
[11669.405685] sd 19:0:0:0: [sdb] Attached SCSI disk
[11670.254827] EXT4-fs (sdb3): mounted filesystem with ordered data mode. Opts: 
(null)

as far as I see it gets at the new automount a new usb address? Can it
be that the drive after unmount somehow reinitializes itself presenting
itself as another device, or is being recognized as a new device and
this is why re-automounted?


** Attachment added: "recordmydesktop output, mplayer plays it alright."
   
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/748151/+attachment/1970456/+files/out.ogv

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Title:
  "Safely Remove" USB drive works great, but is remounted immediately

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