Description of problem:

When powering on my external USB-HD I am observing this in /var/log/messages:


Feb 14 09:11:52 beck kernel: [  412.689038] usb 1-1: new high speed USB device using ehci_hcd and address 2
Feb 14 09:11:52 beck kernel: [  412.832306] usb 1-1: New USB device found, idVendor=174c, idProduct=55aa
Feb 14 09:11:52 beck kernel: [  412.832311] usb 1-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
Feb 14 09:11:52 beck kernel: [  412.832314] usb 1-1: Product: AS2105
Feb 14 09:11:52 beck kernel: [  412.832317] usb 1-1: Manufacturer: ASMedia
Feb 14 09:11:52 beck kernel: [  412.832319] usb 1-1: SerialNumber: 0123456789ABCDEF
Feb 14 09:11:52 beck kernel: [  412.832883] scsi7 : usb-storage 1-1:1.0
Feb 14 09:12:02 beck kernel: [  423.113020] scsi 7:0:0:0: Direct-Access     SAMSUNG  HD154UI          1AG0 PQ: 0 ANSI: 0
Feb 14 09:12:02 beck kernel: [  423.113617] sd 7:0:0:0: Attached scsi generic sg8 type 0
Feb 14 09:12:02 beck kernel: [  423.114377] sd 7:0:0:0: [sdg] 2930277168 512-byte logical blocks: (1.50 TB/1.36 TiB)
Feb 14 09:12:02 beck kernel: [  423.116886] sd 7:0:0:0: [sdg] Write Protect is off
Feb 14 09:12:02 beck kernel: [  423.116894] sd 7:0:0:0: [sdg] Assuming drive cache: write through
Feb 14 09:12:02 beck kernel: [  423.118808] sd 7:0:0:0: [sdg] Assuming drive cache: write through
Feb 14 09:12:02 beck kernel: [  423.118815]  sdg: sdg1
Feb 14 09:12:02 beck kernel: [  423.128136] sd 7:0:0:0: [sdg] Assuming drive cache: write through
Feb 14 09:12:02 beck kernel: [  423.128140] sd 7:0:0:0: [sdg] Attached SCSI disk
Feb 14 09:12:03 beck kernel: [  423.332057] sd 7:0:0:0: [sdg] Sense Key : Recovered Error [current] [descriptor]
Feb 14 09:12:03 beck kernel: [  423.332063] Descriptor sense data with sense descriptors (in hex):
Feb 14 09:12:03 beck kernel: [  423.332065]         72 01 04 1d 00 00 00 0a 09 0c 00 00 00 00 00 07 
Feb 14 09:12:03 beck kernel: [  423.332075]         00 00 
Feb 14 09:12:03 beck kernel: [  423.332078] sd 7:0:0:0: [sdg] ASC=0x4 ASCQ=0x1d
Feb 14 09:12:03 beck kernel: [  423.350809] sd 7:0:0:0: [sdg] Sense Key : Recovered Error [current] [descriptor]
Feb 14 09:12:03 beck kernel: [  423.350816] Descriptor sense data with sense descriptors (in hex):
Feb 14 09:12:03 beck kernel: [  423.350818]         72 01 04 1d 00 00 00 0e 09 0c 00 00 00 00 ae 87
Feb 14 09:12:03 beck kernel: [  423.350826]         00 7a 00 a8 40 50  
Feb 14 09:12:03 beck kernel: [  423.350830] sd 7:0:0:0: [sdg] ASC=0x4 ASCQ=0x1d
Feb 14 09:12:03 beck kernel: [  423.354685] sd 7:0:0:0: [sdg] Sense Key : Recovered Error [current] [descriptor]
Feb 14 09:12:03 beck kernel: [  423.354689] Descriptor sense data with sense descriptors (in hex):
Feb 14 09:12:03 beck kernel: [  423.354691]         72 01 04 1d 00 00 00 0e 09 0c 00 00 00 00 00 07
Feb 14 09:12:03 beck kernel: [  423.354699]         00 08 00 00 40 50 
Feb 14 09:12:03 beck kernel: [  423.354703] sd 7:0:0:0: [sdg] ASC=0x4 ASCQ=0x1d
Feb 14 09:12:03 beck kernel: [  423.696909] sd 7:0:0:0: [sdg] Sense Key : Recovered Error [current] [descriptor]
Feb 14 09:12:03 beck kernel: [  423.696913] Descriptor sense data with sense descriptors (in hex):
Feb 14 09:12:03 beck kernel: [  423.696915]         72 01 04 1d 00 00 00 0e 09 0c 00 00 00 00 00 0f
Feb 14 09:12:03 beck kernel: [  423.696923]         00 08 00 00 40 50 
Feb 14 09:12:03 beck kernel: [  423.696927] sd 7:0:0:0: [sdg] ASC=0x4 ASCQ=0x1d
Feb 14 09:12:03 beck kernel: [  423.702284] sd 7:0:0:0: [sdg] Sense Key : Recovered Error [current] [descriptor]
Feb 14 09:12:03 beck kernel: [  423.702288] Descriptor sense data with sense descriptors (in hex):
Feb 14 09:12:03 beck kernel: [  423.702290]         72 01 04 1d 00 00 00 0e 09 0c 00 00 00 00 ae 00
Feb 14 09:12:03 beck kernel: [  423.702298]         00 4f 00 c2 00 50 
Feb 14 09:12:03 beck kernel: [  423.702302] sd 7:0:0:0: [sdg] ASC=0x4 ASCQ=0x1d
Feb 14 09:12:04 beck kernel: [  424.775236] EXT4-fs (sdg1): mounted filesystem with ordered data mode. Opts: (null)

Version-Release number of selected component (if applicable):
kernel-2.6.35.11-83.fc14.x86_64

How reproducible:
Always

Steps to Reproduce:
1. boot with external HD powered down.
2. login
3. power up external HD, watch /var/log/messages
  
Actual results:
c.f. above

Additional info:
- This is a USB-3 enclosure attached to a USB-2 port.
- The drive appears (Brand new enclosed, no longer term experience, yet) to be working after having issued these warnings, except upon shutdown, where it occasionally seems to hangs.