Time machine on external drive will not back up itunes media file on a separate external drive. Have already reformated itunes media drive,dragged itunes media backup file from time machine (old copy) and removed time machine plist and restarted.

Two external drives, one for time machine backups and a second (daisy chained firewire) for itunes media folder . Time machine fails to backup the media file saying could not be completed, with no error specified. Steps taken already include reformating drive with media, dragging older media backup file from time machine disc to media disc, and deleting time machine plist and starting time macine preferences upon startup. Media folder is approx 200 gb, mostly ripped dvd movies.
Any help for this??
Thanks

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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    The late James Pond left us these wonderful illustrated guides, including this one:
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