Cant locate my files in Sandisk 64GB otg micros usb

I am unable to locate my files in the flash drive. The drive shows space occupied



But I am unable to locate my files as it shows empty. I tries showing up hidden files but didn't succeed as it shows file not found.




Also, I tried chkdsk and I got the results as :

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Windows\system32>I:
I:\>chkdsk
The type of the file system is NTFS.
The volume is in use by another process. Chkdsk
might report errors when no corruption is present.
WARNING! F parameter not specified.
Running CHKDSK in read-only mode.
CHKDSK is verifying files (stage 1 of 3)...
4096 file records processed.
File verification completed.
0 large file records processed.
0 bad file records processed.
0 EA records processed.
0 reparse records processed.
CHKDSK is verifying indexes (stage 2 of 3)...
77 percent complete. (4099 of 4134 index entries processed)
Error detected in index $I30 for file 24.
Error detected in index $I30 for file 24.
Error detected in index $I30 for file 871.
Error detected in index $I30 for file 871.
Error detected in index $I30 for file 874.
Error detected in index $I30 for file 874.
Error detected in index $I30 for file 996.
Error detected in index $I30 for file 996.
Error detected in index $I30 for file 1063.
Error detected in index $I30 for file 1063.
Index entry 008 Identification and Authentication.mp4 in index $I30 of file 1063
is incorrect.
Index entry 015INT~1.MP4 in index $I30 of file 1063 is incorrect.
Error detected in index $I30 for file 1446.
Error detected in index $I30 for file 1446.
4134 index entries processed.
Index verification completed.
Errors found. CHKDSK cannot continue in read-only mode.

I:\>chkdsk /f
The type of the file system is NTFS.
Cannot lock current drive.
Chkdsk cannot run because the volume is in use by another
process. Chkdsk may run if this volume is dismounted first.
ALL OPENED HANDLES TO THIS VOLUME WOULD THEN BE INVALID.
Would you like to force a dismount on this volume? (Y/N) Y
Volume dismounted. All opened handles to this volume are now invalid.
CHKDSK is verifying files (stage 1 of 3)...
4096 file records processed.
File verification completed.
0 large file records processed.
0 bad file records processed.
0 EA records processed.
0 reparse records processed.
CHKDSK is verifying indexes (stage 2 of 3)...
76 percent complete. (4038 of 4134 index entries processed)
An unspecified error occurred (696e647863686b2e dee).

I:\>chkdsk /r
The type of the file system is NTFS.
Cannot lock current drive.
Chkdsk cannot run because the volume is in use by another
process. Chkdsk may run if this volume is dismounted first.
ALL OPENED HANDLES TO THIS VOLUME WOULD THEN BE INVALID.
Would you like to force a dismount on this volume? (Y/N) y
Volume dismounted. All opened handles to this volume are now invalid.
CHKDSK is verifying files (stage 1 of 5)...
4096 file records processed.
File verification completed.
0 large file records processed.
0 bad file records processed.
0 EA records processed.
0 reparse records processed.
CHKDSK is verifying indexes (stage 2 of 5)...
An unspecified error occurred (696e647863686b2e dee).

I need the data urgently as Its the only copy I have. Please help