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possible disk corruption... can I check for corruption with server online?

we have a windows file server.  We use it to house recordings (we are a call center)... there are millions of recording files... a LOT of them went missing... strange thing is I can't seem to find them anywhere on the disk BUT the free space did not drop drastically like I would expect had they been accidentally deleted.

I am a little afraid if I start a full dskchk with server offline it could take a VERY long time (millions of small files adding up to about 4.2TB.  

Is there a way I can atleast check if there is corruption on the disk without having to bring the server down?
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Distinguished Expert 2019
Male sure you can see hidden files.
Best option is to remove system from production to avoid overwrites and make recovery a possibility.
Test-disk ntdatabank or similar data recovery tools.

Sounds that you do not have backups.

Access? Scanning all systems for .......
Based on the below, it seems you would be required to reboot.
Yes, you can use CHKDSK /C: or any drive letters that you wish.

but be careful when using /F as it may delete the corrupted files.
Simple Geek from the '70s
Distinguished Expert 2019
to test
chkntfs c: or  chkdsk c: (not /C:)

to fix usually the drive must be offline


just to confirm - does this look good?

C:\Users\administrator>chkdsk F:
The type of the file system is NTFS.
Volume label is Recordings.

WARNING!  F parameter not specified.
Running CHKDSK in read-only mode.

CHKDSK is verifying files (stage 1 of 3)...
  45394944 file records processed.
File verification completed.
  129916 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)...
  45877712 index entries processed.
Index verification completed.
  0 unindexed files scanned.
  0 unindexed files recovered.
CHKDSK is verifying security descriptors (stage 3 of 3)...
  45394944 file SDs/SIDs processed.
Security descriptor verification completed.
  241385 data files processed.
CHKDSK is verifying Usn Journal...
  34231136 USN bytes processed.
Usn Journal verification completed.
Windows has checked the file system and found no problems.

   5516670 MB total disk space.
   4775126 MB in 11892412 files.
   7236552 KB in 241386 indexes.
         0 KB in bad sectors.
  45678135 KB in use by the system.
     65536 KB occupied by the log file.
 706427180 KB available on disk.

      4096 bytes in each allocation unit.
1412267775 total allocation units on disk.
 176606795 allocation units available on disk.
Distinguished Expert 2019

since it reports no errors - that looks fine !