Here are the logs. I/O errors do increase in number, by the end of the day they appear every 20 sec.
After erasing logs - no I/O errors at all.
3/9/14 12:13:39.766 PM systemstatsd[323]: assertion failed: 13C64: systemstatsd + 3348 [13AA9855-9163-3CE2-91B4-617E23A64044]: 0xa
3/9/14 12:13:47.002 PM xpcd[196]: restored permissions (100600 -> 100700) on /Users/andreybaburin/Library/Containers/com.apple.mail/Container.plist
3/9/14 12:13:50.569 PM WindowServer[107]: disable_update_timeout: UI updates were forcibly disabled by application "Mail" for over 1.00 seconds. Server has re-enabled them.
3/9/14 12:13:54.307 PM WindowServer[107]: common_reenable_update: UI updates were finally reenabled by application "Mail" after 4.74 seconds (server forcibly re-enabled them after 1.00 seconds)
3/9/14 12:13:54.336 PM com.apple.SecurityServer[14]: Session 100016 created
3/9/14 12:13:59.266 PM xpcproxy[353]: assertion failed: 13C64: xpcproxy + 3438 [D559FC96-E6B1-363A-B850-C7AC9734F210]: 0x2
3/9/14 12:14:27.310 PM Mail[347]: CoreText CopyFontsForRequest received mig IPC error (FFFFFFFFFFFFFECC) from font server
3/9/14 12:14:27.310 PM Mail[347]: CoreText CopyFontsForRequest received mig IPC error (FFFFFFFFFFFFFECC) from font server
3/9/14 12:14:38.115 PM apsd[208]: Unrecognized leaf certificate
3/9/14 12:15:14.469 PM WindowServer[107]: disable_update_timeout: UI updates were forcibly disabled by application "Safari" for over 1.00 seconds. Server has re-enabled them.
3/9/14 12:15:14.702 PM WindowServer[107]: common_reenable_update: UI updates were finally reenabled by application "Safari" after 1.23 seconds (server forcibly re-enabled them after 1.00 seconds)
3/9/14 12:15:17.721 PM Google Chrome Helper[336]: CarbonCore: getattrlist(/home, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:17.721 PM Google Chrome Helper[302]: CarbonCore: getattrlist(/home, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:17.721 PM Google Chrome Helper[344]: CarbonCore: getattrlist(/home, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:17.721 PM Google Chrome Helper[342]: CarbonCore: getattrlist(/home, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:17.736 PM Google Chrome Helper[342]: CarbonCore: getattrlist(/net, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:17.736 PM Google Chrome Helper[344]: CarbonCore: getattrlist(/net, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:17.736 PM Google Chrome Helper[336]: CarbonCore: getattrlist(/net, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:17.737 PM Google Chrome Helper[302]: CarbonCore: getattrlist(/net, ATTR_VOL_CAPABILITIES, ...) failed (-1) with errno 1
3/9/14 12:15:18.168 PM WindowServer[107]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
3/9/14 12:15:18.352 PM WindowServer[107]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 1.18 seconds (server forcibly re-enabled them after 1.00 seconds)
3/9/14 12:15:22.559 PM sandboxd[361]: ([347]) Mail(347) deny file-issue-extension /Applications/Safari.app
3/9/14 12:15:35.123 PM com.apple.SecurityServer[14]: Session 100017 created
3/9/14 12:15:36.525 PM com.apple.IconServicesAgent[224]: main Failed to composit image for binding VariantBinding [0x3f3] flags: 0x8 binding: FileInfoBinding [0x2fd] - extension: wma, UTI: com.microsoft.windows-media-wma, fileType: ????.
3/9/14 12:15:36.527 PM quicklookd[366]: Warning: Cache image returned by the server has size range covering all valid image sizes. Binding: VariantBinding [0x203] flags: 0x8 binding: FileInfoBinding [0x103] - extension: wma, UTI: com.microsoft.windows-media-wma, fileType: ???? request size:16 scale: 1
3/9/14 12:15:37.218 PM com.apple.IconServicesAgent[224]: main Failed to composit image for binding VariantBinding [0x3f9] flags: 0x8 binding: FileInfoBinding [0x129] - extension: mp3, UTI: public.mp3, fileType: ????.
3/9/14 12:15:37.220 PM quicklookd[366]: Warning: Cache image returned by the server has size range covering all valid image sizes. Binding: VariantBinding [0x403] flags: 0x8 binding: FileInfoBinding [0x303] - extension: mp3, UTI: public.mp3, fileType: ???? request size:16 scale: 1
3/9/14 12:17:16.000 PM kernel[0]: disk0s2: I/O error.
3/9/14 12:17:20.000 PM kernel[0]: disk0s2: I/O error.
3/9/14 12:17:20.711 PM systemstatsd[323]: assertion failed: 13C64: systemstatsd + 3348 [13AA9855-9163-3CE2-91B4-617E23A64044]: 0xa
3/9/14 12:17:20.958 PM com.apple.WebKit.Networking[364]: CFNetwork SSLHandshake failed (-9806)
3/9/14 12:17:21.128 PM com.apple.WebKit.Networking[364]: CFNetwork SSLHandshake failed (-9806)
3/9/14 12:17:21.135 PM com.apple.WebKit.Networking[364]: CFNetwork SSLHandshake failed (-9806)
3/9/14 12:17:21.165 PM com.apple.WebKit.Networking[364]: CFNetwork SSLHandshake failed (-9806)
3/9/14 12:17:43.755 PM com.apple.IconServicesAgent[224]: main Failed to composit image for binding VariantBinding [0x20f] flags: 0x8 binding: FileInfoBinding [0x305] - extension: jpg, UTI: public.jpeg, fileType: ????.
3/9/14 12:17:43.757 PM quicklookd[377]: Warning: Cache image returned by the server has size range covering all valid image sizes. Binding: VariantBinding [0x403] flags: 0x8 binding: FileInfoBinding [0x303] - extension: jpg, UTI: public.jpeg, fileType: ???? request size:64 scale: 1
3/9/14 12:17:59.097 PM universalAccessAuthWarn[274]: AccessibilityAPI: pid 311, is not allowed to access the accessibility API. Path: /Library/Little Snitch/Little Snitch Agent.app/Contents/MacOS/Little Snitch Agent
3/9/14 12:18:18.965 PM com.apple.SecurityServer[14]: Session 100005 created
3/9/14 12:18:34.000 PM kernel[0]: considerRebuildOfPrelinkedKernel prebuild rebuild has expired
3/9/14 12:18:46.415 PM secd[215]: 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)
3/9/14 12:18:46.416 PM secd[215]: securityd_xpc_dictionary_handler com.apple.sbd[412] DeviceInCircle The operation couldn’t be completed. (com.apple.security.sos.error error 2 - Public Key not available - failed to register before call)
3/9/14 12:19:23.986 PM mds[33]: (Normal) ImportServer: Ignoring blacklisted Spotlight importer plugin:/Developer/Applications/Xcode.app/Contents/Library/Spotlight/SourceCode. mdimporter uuid:548A3091-3C5D-498A-A329-B532A6C896BB version:1586
3/9/14 12:19:24.064 PM mds[33]: (Normal) ImportServer: Ignoring blacklisted Spotlight importer plugin:/Developer/Applications/Xcode.app/Contents/Library/Spotlight/SourceCode. mdimporter uuid:548A3091-3C5D-498A-A329-B532A6C896BB version:1586
3/9/14 12:19:31.700 PM System Events[426]: .sdef warning for part of complex type 'any | number | boolean | date | list | record | text | data' used in suite 'Property List Suite': 'data' is not a valid type name.
3/9/14 12:19:31.703 PM System Events[426]: .sdef warning for type 'text | missing value | any' attribute 'uniqueID' of class 'XML element' in suite 'XML Suite': AppleScript ID references may not work for this property because its type is not NSNumber- or NSString-derived.
3/9/14 12:20:28.438 PM Console[455]: setPresentationOptions called with NSApplicationPresentationFullScreen when there is no visible fullscreen window; this call will be ignored.
3/9/14 12:20:53.229 PM mds[33]: (Normal) ImportServer: Ignoring blacklisted Spotlight importer plugin:/Developer/Applications/Xcode.app/Contents/Library/Spotlight/SourceCode. mdimporter uuid:548A3091-3C5D-498A-A329-B532A6C896BB version:1586
3/9/14 12:20:53.419 PM mds[33]: (Normal) ImportServer: Ignoring blacklisted Spotlight importer plugin:/Developer/Applications/Xcode.app/Contents/Library/Spotlight/SourceCode. mdimporter uuid:548A3091-3C5D-498A-A329-B532A6C896BB version:1586
3/9/14 12:21:39.000 PM kernel[0]: disk0s2: I/O error.
3/9/14 12:21:42.000 PM kernel[0]: disk0s2: I/O error.
3/9/14 12:21:42.824 PM systemstatsd[323]: assertion failed: 13C64: systemstatsd + 3348 [13AA9855-9163-3CE2-91B4-617E23A64044]: 0xa