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Deleted file mapped onto existing file...how is this happening??


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9 replies to this topic

#1 pixart8

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Posted 04 September 2011 - 09:23 AM

Well, sort of strange thing happening with my pc.

I'll give an example: two files, names 1st_file.avi, 2nd_file.avi, nearly same size, at different locations. Now I deleted 1st_file.avi and 2-3 weeks after deletion, I open 2nd_file.avi (which wasn't deleted) and find that instead of the original 2nd_file.avi, the contents of 1st_file.avi are being played.

How can the contents of 1st_file.avi mapped onto the the contents of 2nd_file.avi? And where did my 2nd_file.avi go??

thanks for being patient and reading it through :)

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#2 pixart8

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Posted 14 September 2011 - 01:49 AM

bump

#3 gekas

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Posted 14 September 2011 - 04:27 AM

The only explanation I can think of is corrupted file system, that is the directory record for 2nd_file.avi points to a wrong MFT record (MFT record is what actually represents a file, the names you see in the folder view are just pointers). Right-click your disk drive, select Properties, Tools, Error-checking. Check also your drive's SMART attributes (with HddScan utility, for instance) - the issue may be caused by disk degradation.

Edited by gekas, 14 September 2011 - 04:27 AM.


#4 Layback Bear

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Posted 14 September 2011 - 06:40 AM

You could also run sfc /scannow. System file checker will check Windows file system. If a problem is found run sfc /scannow two more times. Some times the sfc can't repair all the problems with one run. Notice the space between the c and /. If you get avi back I would leave it alone.
This is a good read.
http://en.wikipedia.org/wiki/Audio_Video_Interleave

#5 pixart8

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Posted 15 September 2011 - 12:04 PM

thanks for replying...I tried error checking and no issues were found...Anyways, I just deleted the file and letting the topic rest till it recurs.

Edited by pixart8, 15 September 2011 - 12:05 PM.


#6 gekas

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Posted 15 September 2011 - 03:01 PM

If your disk is degrading, there will not be long before you lose something you can't afford to lose. I'd strongly suggest checking your drive's S.M.A.R.T. attributes. If any of them is in the red zone (especially the sector relocation count), then you better be prepared.

#7 pixart8

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Posted 18 September 2011 - 02:33 AM

hi!

thanks gekas! I just used DiskCheckup to check my drive's S.M.A.R.T. attributes.. I need help to understand whether everything is ok or not.

report follows (sorry to sound dumb, but Status is OK for all but all the values are worst?? how is that happening? Or am I misinterpreting the results...?)

SMART ATTRIBUTES:
ID Description Status Value Worst Threshold Raw Value TEC
---------------------------------------------------------------------------------------------------------------------------------------------
1 Raw Read Error Rate OK 100 100 50 0 N.A.
2 Throughput Performance OK 100 100 50 0 N.A.
3 Spin Up Time OK 100 100 1 1024 N.A.
4 Start/Stop Count OK 100 100 0 2705 N.A.
5 Reallocated Sector Count OK 100 100 50 40 N.A.
7 Seek Error Rate OK 100 100 50 0 N.A.
8 Seek Time Performance OK 100 100 50 0 N.A.
9 Power On Time OK 79 79 0 8712 N.A.
10 Spin Retry Count OK 153 100 30 0 N.A.
12 Power Cycle Count OK 100 100 0 2467 N.A.
191 G-sense Error Rate OK 100 100 0 81313 N.A.
192 Power off Retract Count OK 100 100 0 78 N.A.
193 Load Cycle Count OK 93 93 0 76183 N.A.
194 Temperature OK 100 100 0 36 C N.A.
196 Reallocation Event Count OK 100 100 0 37 N.A.
197 Current Pending Sector Count OK 100 100 0 0 N.A.
198 Uncorrectable Sector Count OK 100 100 0 0 N.A.
199 UltraDMA CRC Error Count OK 200 200 0 0 N.A.
220 Disk shift OK 100 100 0 42 N.A.
222 Loaded hours OK 86 86 0 5995 N.A.
223 Load/Unload retry count OK 100 100 0 0 N.A.
224 Load friction OK 100 100 0 0 N.A.
226 Load-in Time OK 100 100 0 332 N.A.
240 Head flying hours OK 100 100 1 0 N.A.

#8 pixart8

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Posted 18 September 2011 - 02:34 AM

sorry...didn't know that pasting it wouldn't preserve spacing.

#9 gekas

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Posted 18 September 2011 - 08:09 AM

'Worst' equals the value unless the value can change both ways. Just ignore it.

I don't quite understand your values. 'Reallocated Sector Count' is 100, which usually means OK, at least for Seagate drives. But the raw value is non-zero (40), which hints that there were some relocations. Maybe someone with a better knowledge of SMART can explain it. I suggest checking the attributes regularly, and if you notice that 'Reallocated Sector Count' is changing, be ready. Although I must say that daily backups is a must for everyone, no matter what SMART attributes show.

If you are interested to learn more, you can a lot of info and links in wiki.

#10 pixart8

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Posted 22 September 2011 - 07:32 AM

thanks Gekas...I checked SMART values again, raw value is 40 again (no change) .. but I'll stay alert and follow daily backup routine just to be on a safer side.




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