Am I entering the wrong arguments?
From the (minimal) documentation (readme.txt) the quotes " are not required for the filenames argument:
The -r command line switch may be used to walk the directory tree; for example, to get the MD5 hashes of the entire Windows directory tree, run
"md5sum -r C:\Windows".
You cannot use just a drive name as the filename argument.
Try the following command:
md5sum.exe -r F:\* Example:
md5sum -r e:\* 44f15d5d40b008749fbd38b754cb4e58 *e:\Agent\00000001.IDX e6415767b23268f2bf28da9b90bcab73 *e:\Agent\00000002.IDX 4370bafc009a65b3dc2e6c721e6b5da4 *e:\Agent\00000003.IDX cc8a1bf949ef58c3effe5a65f97c8052 *e:\Agent\00000004.IDX 2d4ba87616ecbd0d815895dce274cf9c *e:\Agent\00000005.IDX ...