Nautilus only gives an "Unmount" menu option when I right click the eSATA mounts. It also shows the eject icon, which does just an unmount. I wouldn't expect anything more than just the Unmount option because it seems the kernel can never know the difference between an eSATA drive and an internal SATA drive that has been hot-plugged.

gvfs-mount correctly shows can_unmount=1 so I would expect the launcher to follow that... ?

=== gvfs-mount -li ===

Drive(1): 500 GB Hard Disk
  Type: GProxyDrive (GProxyVolumeMonitorGdu)
  ids:
   unix-device: '/dev/sdi'
  themed icons:  [drive-harddisk-ata]  [drive-harddisk]  [drive]
  is_media_removable=0
  has_media=1
  is_media_check_automatic=0
  can_poll_for_media=0
  can_eject=0
  can_start=0
  can_stop=0
  start_stop_type=unknown
  Volume(0): Extty
    Type: GProxyVolume (GProxyVolumeMonitorGdu)
    ids:
     unix-device: '/dev/sdi2'
     uuid: 'a158e93c-9d06-4c9d-8f24-6129e6093429'
     label: 'Extty'
    themed icons:  [drive-harddisk-ata]  [drive-harddisk]  [drive]
    can_mount=1
    can_eject=0
    should_automount=0
    Mount(0): Extty -> file:///media/Extty
      Type: GProxyMount (GProxyVolumeMonitorGdu)
      default_location=file:///media/Extty
      themed icons:  [drive-harddisk-ata]  [drive-harddisk]  [drive]
      can_unmount=1
      can_eject=0
      is_shadowed=0
  Volume(1): Fatty
    Type: GProxyVolume (GProxyVolumeMonitorGdu)
    ids:
     unix-device: '/dev/sdi1'
     uuid: '6C25-A47A'
     label: 'Fatty'
    themed icons:  [drive-harddisk-ata]  [drive-harddisk]  [drive]
    can_mount=1
    can_eject=0
    should_automount=0
    Mount(0): Fatty -> file:///media/Fatty
      Type: GProxyMount (GProxyVolumeMonitorGdu)
      default_location=file:///media/Fatty
      themed icons:  [drive-harddisk-ata]  [drive-harddisk]  [drive]
      can_unmount=1
      can_eject=0
      is_shadowed=0

=== mount ===

/dev/sdi1 on /media/Fatty type vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush)
/dev/sdi2 on /media/Extty type ext4 (rw,nosuid,nodev,uhelper=udisks)

=== dmesg ===

[177559.947766] ata6: exception Emask 0x50 SAct 0x0 SErr 0x40d0800 action 0xe frozen
[177559.947770] ata6: irq_stat 0x00000040, connection status changed
[177559.947774] ata6: SError: { HostInt PHYRdyChg CommWake 10B8B DevExch }
[177559.947781] ata6: hard resetting link
[177562.630013] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[177562.659855] ata6.00: ATA-8: WDC WD5000BEVT-22A0RT0, 01.01A01, max UDMA/133
[177562.659858] ata6.00: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
[177562.662864] ata6.00: configured for UDMA/133
[177562.680015] ata6: EH complete
[177562.680097] scsi 5:0:0:0: Direct-Access     ATA      WDC WD5000BEVT-2 01.0 PQ: 0 ANSI: 5
[177562.680299] sd 5:0:0:0: [sdi] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[177562.680315] sd 5:0:0:0: Attached scsi generic sg9 type 0
[177562.680359] sd 5:0:0:0: [sdi] Write Protect is off
[177562.680363] sd 5:0:0:0: [sdi] Mode Sense: 00 3a 00 00
[177562.680389] sd 5:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[177562.685766]  sdi: sdi1 sdi2
[177562.686017] sd 5:0:0:0: [sdi] Attached SCSI disk

=== hdparm -i /dev/sdi ===

/dev/sdi:

 Model=WDC WD5000BEVT-22A0RT0, FwRev=01.01A01, SerialNo=WD-WX51A3069996
 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=50
 BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=976773168
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 
 AdvancedPM=yes: unknown setting WriteCache=enabled
 Drive conforms to: Unspecified:  ATA/ATAPI-1,2,3,4,5,6,7

 * signifies the current active mode