Nitro microSD getting corrupted & loss of files

I was working on an Excel 2010 file on my Win 7 x64 laptop & it's running low on battery so I saved
the Excel file to a Nitro MicroSD (that's inserted inside an SD adapter that comes  bundled with the
Nitro).

Then I worked on another laptop (Win XP x32bit) that has more battery that uses Excel 2003 with
an MS converter: amount of data entered into Excel is like 3 over hours of data entry: Excel 2003
 disallows me to do "Save" as it indicated "Read Only" so I did "Save As" to save another file name
& the converter saves it to the Nitro as an .xlsx (this is an Excel 2010 format) after conversion
without any error message & I hibernated my Win XP laptop properly.

Now both the Excel 2003 on the Win XP as well as the Excel 2010 on the Win 7 laptops (as well as
my kid's MS Excel 2013 on her Macbook when I emailed it to her) could NOT read this saved xlsx
 file, giving the error message shown in attachment 1.

Q1:
I need back this Excel file as it's worth more than 3 hours of work.  How can I recover back the
Excel file with 3+ hours of work?

Q2:
What's the next best courses of actions I should take now?  I reckon there's something wrong with
this Nitro microSD which I got from Amazon.  All my previous SD & thumb drives which I work &
copy Excel files between the 2 laptops never gave this issue, so don't think it's a laptop nor
Windows nor MS Excel issue but the Nitro or the microSD to SD adapter issue.

Q3:
How do I determine which component is at fault?  Do I copy out everything first from this Nitro
& reformat it to prevent future recurrence?  Read that this Nitro is a fast thingy, so not sure if
the two laptop's SD reader slots cant copy with the speed?

Subsequently when I copy more files to this Nitro from the Win 7 laptop & did a directory listing, it
gave lots of garbage characters as shown below:

 Directory of E:\ipfeb

[.]
[..]
010215-080215.csv
16to28T25Feb.zip
16_28Fb.csv
16_28T25.csv
16_28T25Tr.csv
1to22T25Feb.zip
1_15Febt25T.csv
1_15Febt25Tr.csv
1_28Febt25Tr.csv
1_28FebT25Tr_Rejonly.xlsx
1_28FebT25Tr_RejonlySml.xlsx
1_28Febt25Tr_woAction.csv
1_28Febt25Tr_woAction_DropMononly.xlsx
1_28Febt25Tr_woAction_DropMononlySml.xlsx
1_8Febt25T.csv
9_15Fb.csv
9_15Feb.csv
9_15t25FebT.csv
alT25Feb.csv
alT25FebTnogood.csv
BBBFebtopIps.xlsx
Cl_Top5_Event_Feb15_V2.xlsx  <== good original Excel
Cl_Top5_Event_Feb15_V3.xlsx <== bad unreadable Excel
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              76 File(s) 185,396,831,180 bytes
              41 Dir(s)   5,086,674,944 bytes free
CorruptExcelNitromicroSD.jpg
sunhuxAsked:
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andreasSystem AdminCommented:
looks like filesystem damage.
at first you need to make an image of the sd card anmd then try some recovery tools like disk digger, pghotorec or get data back NTFS/FAT.

If those things are failing you can try to repair the rescued files with some exel-file repair tools, but there ive no advice for you which one is good as ive never used/need one before.
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sunhuxAuthor Commented:
I'll need someone who has tried the freeware recovery tools to advise which ones
they're comfortable with
0
sunhuxAuthor Commented:
I combed thru my local c:\ drive by issuing
" c: "
" dir/s *top5*v3.xls* " & got the following :

 Directory of C:\Documents and Settings\Administrator\Application Data\Microsoft
\Office\Recent

03/08/2015  04:05 PM               386 Cl_Top5_Event_Feb15_V3.xlsx
03/08/2015  11:27 AM               389 Cl_Top5_Event_Feb15_V3.xlsx
               2 File(s)            775 bytes

 Directory of C:\Documents and Settings\Administrator\Recent

03/08/2015  04:05 PM               406 Cl_Top5_Event_Feb15_V3.xlsx
03/08/2015  04:04 PM               409 Cl_Top5_Event_Feb15_V3.xlsx
               2 File(s)            815 bytes

     Total Files Listed:
               4 File(s)          1,590 bytes


Are they of any help?  I think the link files link to the file on microSD
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andreasSystem AdminCommented:
sometimes this also can happen when you have a faked card.

how full was the card at the time of the incident? was it nearly half full?

if file gots defective coz pf a fake size report than there is nearly zero chance to recover.
0
sunhuxAuthor Commented:
>how full was the card at the time of the incident? was it nearly half full?

About half full.  Doubt Amazon will sell fake stuff or wont it?
0
sunhuxAuthor Commented:
Before I next reuse this card (or any other microSD card), is there any tool or
any function (such as reformatting it or test it writing/reading it to the full)
that I can do in advance to ensure the quality of the microSD before actually
using it for production (ie actual data)?
0
sunhuxAuthor Commented:
Well it's actually more than half full judging from the output in my very first post:
Total capacity published is 16GB and the output I gave has only about 5GB free:
     41 Dir(s)   5,086,674,944 bytes free
0
andreasSystem AdminCommented:
is the output from b4 the data corruption or from now, the corrupted state? if its NOW you cant trust it, the free size comes from filesystem information, which is corrupted as you can see on the hiroglyph files/dirs.

the fake(s) on amazon could be unknowingly. sometimes the ftys produce genuine and fakes on the same production line...

to get the rough capacity used, try to copy back all files/dirs that are not hiroglyphes to your harddisk and let the windows calculate the size of the folder where you put all the stuff. You should make some random inspections of the copied files if they are ok or corrupted too to see if other files also got corruptions too.

after that make an image of the drive and save that image away.

then try to format the stick and try to fill it up again, best with unimportant data, such as ISO files/photos/videos and see if you can fill it up to roughly 16 GB without any data corruption, photos are best for testing as in the thumbnail preview you can easyly see if some photos are damaged.

If corruption appears again on filling up the stick its sure the stick is defective/fake. In this case your chances to get the needed files back with recovery tools are much smaller than on a non defective/fake disk.

If the corruption test (filling up agian) went ok you may try to revocer all found files in raw mode and open manually all found exel files until you found the file you want. For recovery you can try smartrecovery, file recovery from convar, get data back for NTFS/FAT, diskdigger and photorec. GetData back is the best software but also a non free one, that needs to be paid, but it has a free trail mode.
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andreasSystem AdminCommented:
PS the recovery of the files you can run from the image you created before, it will run much faster than from the flash memory itself.
But you also can restore that image an a stick/external HDD wich is same size or a bit bigger and try recovery from there.
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sunhuxAuthor Commented:
>is the output from b4 the data corruption or from now, the corrupted state?
Output is taken after the corrupt state occur.

Thanks;  haven't got the chance to copy out the data & reformat it yet.

Other than copying files to it & trying to access files on the microSD, is there
any other way to sort of "sanity-check" if the card is good after reformatting?

I suppose I should not do "quick format" but a "full format", right?
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sunhuxAuthor Commented:
Any specific freeware tool that I can use to increase my chances of recovering
as much data from the microSD?
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andreasSystem AdminCommented:
photorec and the convar flash recovery is worth a try to get your files back.
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andreasSystem AdminCommented:
Formating even full may not be enough to validate the sanity of the card. Write if full and check for errors is most reliable.

You also can write a file with randomnumbers or a bif video file on it and make an md5 sum of the file b4 copy to the card. and one md5sum from the same file after it was copied to the card, if the sum matches the card worked ok in this case so its not a fake. But its still not sure it wil not have a problem again later, you shouldnt put very important stuff on it for a while until the card performed well after formatting for a few weeks.
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