Time Machine Backups external drive developed problem which the disk repair utility cannot fix, so suggested reformat. I can't reformat because the "Resource Busy". How can I reformat this drive?

My Western Digital external hard drive which I use as a Time Machine Backup stopped working. I tried repairing the disk using the Disk Utility program,but got the message that the utility can't repair the disk and to erase and reformat the disk. When I try that, I get the message the operation can't be completed because "Resource Busy", even though Time Machine is turned off. Any suggestions for repairing the drive/disk?
Thank you.

See Pondini's TM FAQs for starters.

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    Tks for the help. Tried to eliminate duplicates. Copy below.
    6/11/14 3:07:33.458 PM com.apple.backupd[532]: Found 2332 files (193.66 GB) needing backup
    6/11/14 3:07:33.488 PM com.apple.backupd[532]: 219.71 GB required (including padding), 539.32 GB available
    6/11/14 3:09:42.200 PM com.apple.backupd[532]: Copied 1201 items (51.5 MB) from volume Macintosh HD. Linked 2894.
    6/11/14 3:10:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:10:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:10:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:10:30.072 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Home Videos/2013 Trip To Kate and Jason - Large 1.m4v to (null)
    6/11/14 3:10:44.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:10:57.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:10:57.327 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Home Videos/2013 Trip To Kate and Jason - Large.m4v to (null)
    6/11/14 3:11:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:11:22.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:11:22.394 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Home Videos/IMG_0378.m4v to (null)
    6/11/14 3:11:57.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:12:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:12:09.872 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Home Videos/IMG_0398.m4v to (null)
    6/11/14 3:12:44.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:12:46.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:13:05.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:13:05.959 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/AAA 2.4.1.ipa to (null)
    6/11/14 3:13:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:13:46.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:13:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:13:51.325 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Air Sharing 3.4.3.ipa to (null)
    6/11/14 3:14:18.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:14:21.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:14:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:14:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:14:51.289 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Angie's List 3.0.2.ipa to (null)
    6/11/14 3:15:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:15:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:15:34.517 PM secd[422]:  SecErrorGetOSStatus unknown error domain: com.apple.security.sos.error for error: The operation couldn’t be completed. (com.apple.security.sos.error error 2 - Public Key not available - failed to register before call)
    6/11/14 3:15:34.517 PM secd[267]:  SecErrorGetOSStatus unknown error domain: com.apple.security.sos.error for error: The operation couldn’t be completed. (com.apple.security.sos.error error 2 - Public Key not available - failed to register before call)
    6/11/14 3:15:34.517 PM secd[267]:  securityd_xpc_dictionary_handler EscrowSecurityAl[581] DeviceInCircle The operation couldn’t be completed. (com.apple.security.sos.error error 2 - Public Key not available - failed to register before call)
    6/11/14 3:15:34.517 PM secd[422]:  securityd_xpc_dictionary_handler EscrowSecurityAl[580] DeviceInCircle The operation couldn’t be completed. (com.apple.security.sos.error error 2 - Public Key not available - failed to register before call)
    6/11/14 3:15:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:15:51.643 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/AP Mobile 6.2.1.ipa to (null)
    6/11/14 3:15:54.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:19.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:19.908 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Apple Store 120269.ipa to (null)
    6/11/14 3:16:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:50.710 PM com.apple.backupd-helper[533]: Not starting scheduled Time Machine backup: Backup already running
    6/11/14 3:16:53.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:00.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:00.552 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Archetype 1.6.2.ipa to (null)
    6/11/14 3:17:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:49.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:28.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:40.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:06.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:18.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:43.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:56.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:11.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:36.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:28.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:53.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:06.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:19.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:31.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:57.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:22.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:50.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:15.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:47.887 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Bloomberg 3.0.ipa to (null)
    6/11/14 3:26:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:13.942 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Calculator 3.4.ipa to (null)
    6/11/14 3:26:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:26.509 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Camera Zoom 3.1.ipa to (null)
    6/11/14 3:26:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:52.108 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Cards 2.0.1.ipa to (null)
    6/11/14 3:27:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:27:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:27:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:27:29.606 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Casino 2.5.ipa to (null)
    6/11/14 3:27:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:00.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:00.327 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Clear Day 2.6.ipa to (null)
    6/11/14 3:28:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:56.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:21.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:34.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:59.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:12.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:24.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:37.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:49.085 PM xpcproxy[629]: assertion failed: 13D65: xpcproxy + 3438 [D559FC96-E6B1-363A-B850-C7AC9734F210]: 0x2
    6/11/14 3:30:49.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:50.194 PM syncdefaultsd[628]: Fixing push token
    6/11/14 3:30:52.507 PM xpcproxy[632]: assertion failed: 13D65: xpcproxy + 3438 [D559FC96-E6B1-363A-B850-C7AC9734F210]: 0x2
    6/11/14 3:31:02.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:27.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:05.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:42.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:58.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:21.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:46.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:49.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:02.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:18.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:30.676 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Collection HD 1.7.ipa to (null)
    6/11/14 3:36:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:36:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:36:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:36:29.651 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/eCardExpress 2.1.ipa to (null)
    6/11/14 3:36:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:45.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:08.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:46.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:04.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:54.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:19.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:54.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:57.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:34.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:12.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:25.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:50.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:25.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:28.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:40.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:20.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:45.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:58.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:00.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:49:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:49:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:49:21.393 PM WindowServer[128]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x04280300 device: 0x7f8ef9d04e00  isBackBuffered: 1 numComp: 3 numDisp: 3
    6/11/14 3:49:21.731 PM launchservicesd[52]: Application App:"System Preferences" asn:0x0-44044 pid:509 refs=7 @ 0x7fb5b9443730 tried to be brought forward, but isn't in fPermittedFrontApps ( ( "LSApplication:0x0-0x45045 pid=513 "com.apple.prefs.backup.remoteservice"")), so denying. : LASSession.cp #1481 SetFrontApplication() q=LSSession 100019/0x186b3 queue
    6/11/14 3:49:21.731 PM WindowServer[128]: [cps/setfront] Failed setting the front application to System Preferences, psn 0x0-0x44044, securitySessionID=0x186b3, err=-13066
    6/11/14 3:49:21.733 PM WindowServer[128]: device_generate_desktop_screenshot: authw 0x0(0), shield 0x7f8ef9e94e00(2001)
    6/11/14 3:49:21.795 PM WindowServer[128]: device_generate_lock_screen_screenshot: authw 0x0(0), shield 0x7f8ef9e94e00(2001)
    6/11/14 3:49:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:50:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:50:48.546 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/GarageBand 1.1.ipa to (null)
    6/11/14 3:51:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:07.747 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Glympse 2.22.444.ipa to (null)
    6/11/14 3:53:20.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:32.869 PM com.apple.backupd[532]: Stopping backup.
    6/11/14 3:53:32.869 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Golf Channel 3.7.2.ipa to (null)
    6/11/14 3:53:33.357 PM com.apple.backupd[532]: Copied 127 items (2.24 GB) from volume Media. Linked 0.
    6/11/14 3:53:33.376 PM com.apple.backupd[532]: Copy stage failed with error:11
    6/11/14 3:53:34.607 PM com.apple.backupd[532]: Backup failed with error 11: 11
    6/11/14 3:55:53.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:56:05.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:56:18.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:56:33.000 PM kernel[0]: disk1s2: I/O error.

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