How can an external drive cause my Internet to slow to a crawl and then fail?

I have two WD My Passport Ultra 1 TB USB 3 new drives. One I'm using for Time Machine and one for CCC (Carbon Copy Cloner). I have been trying to use them with my new MacBook Pro retina 13-inch.
For the last few days I've had weird problems trying to connect them via a USB 3 hub. I though the hub was the problem (because things seemed to be fine until I introduced a hub into the equation) and already returned one.
But now I see the same thing happening even without the hub.
It appears that one drive, when connected to a USB 3 port (it doesn't matter which port), even when it's doing nothing (I erased and and removed the CCC task), causes the Internet to slow to a crawl, and then stop. All connectivity ceases.
The instant I unmount and remove the drive the Internet springs back to normal speeds - over wifi about 110 Mbps.
Disk Utility says there are no problems with the disk. So does WD's only diagnostic utility. And the firmware is up-to-date.
The other disk, running Time Machine, seems to have no issues at all.
I guess I will return this drive. It could be subtly defective in some way. But what way? Why would an external USB 3 drive affect the Internet connectivity?
doug

I came across this post while in search of the answer to the very same question only I am experiencing this problem when connecting to a USB 3.0 hub and nothing else. The resuling slowdown in my internet speed leaves me hanging intermittently between screens in Safari, sometimes indefinitely. When I remove the USB cable, normal speeds resume. Activity Monitor shows no undue load on the CPU. I did not notice this problem until just recently. Could this have something to do with the recent OSX patch.
BTW: I am running a 2012 15" MacBook Pro with Retina display.
Anybody have a clue as to what might be going on here?
Gerry

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Backing up to: /Volumes/BIG_NEW/Backups.backupdb
Event store UUIDs don't match for volume: Macintosh HD
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Deep event scan at path:/ reason:must scan subdirs|new event db|
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1.41 GB required (including padding), 431.36 GB available
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Deleted /Volumes/BIG_NEW/Backups.backupdb/Jon’s MacBook/2012-09-28-013251 (55.1 MB)
Deleted /Volumes/BIG_NEW/Backups.backupdb/Jon’s MacBook/2012-10-23-002733 (3.8 MB)
Deleted /Volumes/BIG_NEW/Backups.backupdb/Jon’s MacBook/2012-10-22-225513 (4.1 MB)
Deleted /Volumes/BIG_NEW/Backups.backupdb/Jon’s MacBook/2012-10-22-215519 (5.7 MB)
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Wed Dec 26 11:53:41 2012
panic(cpu 1 caller 0xffffff80002c4794): Kernel trap at 0xffffff800050b6c2, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x000000001de1b000, CR4: 0x0000000000000660
RAX: 0x0000000000000000, RBX: 0x0000000000000000, RCX: 0x0000000000000000, RDX: 0xffffff8078f02b6e
RSP: 0xffffff8078f02b50, RBP: 0xffffff8078f02c10, RSI: 0xffffff8078f02a18, RDI: 0xffffff800ade4460
R8: 0xffffff8078f02b90, R9: 0xffffff8078f02bd0, R10: 0x0000000000000000, R11: 0xffffff800063dc04
R12: 0x0000000000000001, R13: 0xffffff80198ec408, R14: 0xffffff8019fc7a80, R15: 0xffffff800c376808
RFL: 0x0000000000010297, RIP: 0xffffff800050b6c2, CS: 0x0000000000000008, SS: 0x0000000000000010
CR2: 0x0000000000000000, Error code: 0x0000000000000000, Faulting CPU: 0x1
Backtrace (CPU 1), Frame : Return Address
0xffffff8078f02800 : 0xffffff8000220792
0xffffff8078f02880 : 0xffffff80002c4794
0xffffff8078f02a30 : 0xffffff80002da55d
0xffffff8078f02a50 : 0xffffff800050b6c2
0xffffff8078f02c10 : 0xffffff8000506608
0xffffff8078f02c50 : 0xffffff80004fc01e
0xffffff8078f03090 : 0xffffff80004fdcf3
0xffffff8078f03610 : 0xffffff80004f77a1
0xffffff8078f036f0 : 0xffffff80004f998c
0xffffff8078f037b0 : 0xffffff800030fbbd
0xffffff8078f03af0 : 0xffffff8000310860
0xffffff8078f03f10 : 0xffffff80003108e6
0xffffff8078f03f50 : 0xffffff80005ce4cb
0xffffff8078f03fb0 : 0xffffff80002daea3
BSD process name corresponding to current thread: mount_hfs
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11G63
Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
System model name: MacBook6,1 (Mac-F22C8AC8)
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last loaded kext at 2442664671789: com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1 (addr 0xffffff7f80825000, size 86016)
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jp.co.roland.RDUSB0014Dev          1.0.0
com.Cycling74.driver.Soundflower          1.5.1
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com.apple.filesystems.smbfs          1.7.2
com.apple.driver.AppleBluetoothMultitouch          70.12
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.driver.AudioAUUC          1.59
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.AppleHDA          2.2.5a5
com.apple.driver.AppleMikeyDriver          2.2.5a5
com.apple.driver.AGPM          100.12.75
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.GeForce          7.3.2
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com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.iokit.IOBluetoothSerialManager          4.0.8f17
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.2.3
com.apple.driver.ApplePolicyControl          3.1.33
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d8
com.apple.driver.AppleBacklight          170.2.2
com.apple.driver.AppleMCCSControl          1.0.33
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleUSBTCButtons          227.6
com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.8f17
com.apple.driver.AppleUSBTCKeyboard          227.6
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          33
com.apple.iokit.SCSITaskUserClient          3.2.1
com.apple.iokit.IOAHCISerialATAPI          2.0.3
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.1.0
com.apple.driver.AppleAHCIPort          2.3.1
com.apple.driver.AirPort.Brcm4331          561.7.22
com.apple.nvenet          2.0.17
com.apple.driver.AppleUSBHub          5.1.0
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleUSBEHCI          5.1.0
com.apple.driver.AppleUSBOHCI          5.1.0
com.apple.driver.AppleEFINVRAM          1.6.1
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.7
com.apple.driver.AppleACPIButtons          1.5
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.5
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          195.0.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1.4
com.apple.security.TMSafetyNet          8
com.apple.driver.AppleIntelCPUPowerManagement          195.0.0
com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.1
com.apple.iokit.IOUSBMassStorageClass          3.0.3
com.apple.driver.AppleMultitouchDriver          231.4
com.apple.driver.IOBluetoothHIDDriver          4.0.8f17
com.apple.driver.DspFuncLib          2.2.5a5
com.apple.nvidia.nv50hal          7.3.2
com.apple.NVDAResman          7.3.2
com.apple.iokit.IOSurface          80.0.2
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.iokit.IOAudioFamily          1.8.6fc18
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleHDAController          2.2.5a5
com.apple.iokit.IOHDAFamily          2.2.5a5
com.apple.driver.AppleSMC          3.1.3d10
com.apple.driver.IOPlatformPluginLegacy          5.0.0d8
com.apple.driver.IOPlatformPluginFamily          5.1.1d6
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleGraphicsControl          3.1.33
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.iokit.IONDRVSupport          2.3.4
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.iokit.IOGraphicsFamily          2.3.4
com.apple.kext.triggers          1.0
com.apple.driver.AppleUSBHIDKeyboard          160.7
com.apple.driver.AppleHIDKeyboard          160.7
com.apple.driver.AppleUSBBluetoothHCIController          4.0.8f17
com.apple.iokit.IOBluetoothFamily          4.0.8f17
com.apple.driver.AppleUSBMultitouch          230.5
com.apple.iokit.IOUSBHIDDriver          5.0.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.1
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.driver.AppleUSBMergeNub          5.1.0
com.apple.driver.AppleUSBComposite          5.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.1
com.apple.iokit.IOAHCIFamily          2.0.8
com.apple.iokit.IO80211Family          420.3
com.apple.iokit.IONetworkingFamily          2.1
com.apple.iokit.IOUSBUserClient          5.0.0
com.apple.iokit.IOUSBFamily          5.1.0
com.apple.driver.NVSMU          2.2.9
com.apple.driver.AppleEFIRuntime          1.6.1
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          177.8
com.apple.kext.AppleMatch          1.0.0d1
com.apple.driver.DiskImages          331.7
com.apple.iokit.IOStorageFamily          1.7.2
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.5
com.apple.iokit.IOPCIFamily          2.7
com.apple.iokit.IOACPIFamily          1.4
Some additional background:
I disabled spotlight on the external, except for the backups.
I had installed MicroMat's CheckMate. I'm wondering if there was some sort of collision between Checkmate and Time Machine that could have trashed the external drive.
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Technical Note TN2063: Understanding and Debugging Kernel Panics,
Mac OS X Kernel Panic FAQ,
Resolving Kernel Panics, and
Tutorial: Avoiding and eliminating Kernel panics for more details.

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