Using Python 3.5+ os.scandir() optimized variant.
Starting.
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*Collecting tree differences
comparing [C:/MY-OTHER-STUFF] [D:/MY-OTHER-STUFF]
excluding D:/MY-OTHER-STUFF\__bkp__
comparing [C:/MY-OTHER-STUFF\Books-old] [D:/MY-OTHER-STUFF\Books-old]
comparing [C:/MY-OTHER-STUFF\Books-old\toshiba] [D:/MY-OTHER-STUFF\Books-old\toshiba]
comparing [C:/MY-OTHER-STUFF\Books-old\toshiba\admin] [D:/MY-OTHER-STUFF\Books-old\toshiba\admin]
comparing [C:/MY-OTHER-STUFF\Books-old\toshiba\admin\contracts] [D:/MY-OTHER-STUFF\Books-old\toshiba\admin\contracts]
comparing [C:/MY-OTHER-STUFF\Books-old\toshiba\admin\ORM_author_docs] [D:/MY-OTHER-STUFF\Books-old\toshiba\admin\ORM_author_docs]comparing [C:/MY-OTHER-STUFF\Books-old\toshiba\admin\ORM_author_docs\AU_docs_0408] [D:/MY-OTHER-STUFF\Books-old\toshiba\admin\ORM_author_docs\AU_docs_0408]

...etc...

comparing [C:/MY-OTHER-STUFF\Misc-old\vaioz-to-mar1514\WhoUsesPython-Apr11\Technologist - GETCO - Job Board_files] [D:/MY-OTHER-STUFF\Misc-old\vaioz-to-mar1514\WhoUsesPython-Apr11\Technologist - GETCO - Job Board_files]
comparing [C:/MY-OTHER-STUFF\Misc-old\vaioz-to-mar1514\WhoUsesPython-Apr11\“Why is Python Installed on my Computer ” FAQ — Python v2.7.1 documentation_files] [D:/MY-OTHER-STUFF\Misc-old\vaioz-to-mar1514\WhoUsesPython-Apr11\“Why is Python Installed on my Computer ” FAQ — Python v2.7.1 documentation_files]
comparing [C:/MY-OTHER-STUFF\Misc-old\vaioz-to-mar1514\__pycache__] [D:/MY-OTHER-STUFF\Misc-old\vaioz-to-mar1514\__pycache__]
Phase runtime: 1.630754712093955
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*Reporting tree differences
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SAMEFILE DIFFERENCES: (name, dirfrom, dirto, why)
**These items will be replaced in dirto by automatic resolution**

[]
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UNIQUE ITEMS IN DIRTO: (names, dirfrom, dirto)
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 (['desktop.ini', '~$28-new-decorators.docx', '~$32-new-attributes.docx'],
  'C:/MY-OTHER-STUFF\\Books-old\\toshiba\\LP4E\\dev',
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 (['~$hedule_pypockref[1].docx'],
  'C:/MY-OTHER-STUFF\\Books-old\\toshiba\\PREF4E',
  'D:/MY-OTHER-STUFF\\Books-old\\toshiba\\PREF4E'),
 (['~$ch01.doc'],
  'C:/MY-OTHER-STUFF\\Books-old\\toshiba\\PREF4E\\dev',
  'D:/MY-OTHER-STUFF\\Books-old\\toshiba\\PREF4E\\dev'),
 (['~$05-was04.doc'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\3E\\LP3E\\submits\\LP3E-final-draft-july19\\Final-draft',
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 (['~$ch27.doc'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\copyedit\\lp4e-batch2-16-30',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\copyedit\\lp4e-batch2-16-30'),
 (['desktop.ini', '~$28-new-decorators.docx', '~$32-new-attributes.docx'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\dev',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\dev'),
 (['~$ch05.doc'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\dev\\done',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\dev\\done'),
 (['~$ml-python programming  Books--sep2010-page1.htm'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\marketing',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\LP4E\\marketing'),
 (['~$ch00.doc', '~$ORA.dot'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev'),
 (['Thumbs.db'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev-etc\\Extras\\public_html\\PossiblyUnused',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev-etc\\Extras\\public_html\\PossiblyUnused'),
 (['desktop.ini'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev-etc\\Extras\\Website-Training\\PossiblyUnused',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev-etc\\Extras\\Website-Training\\PossiblyUnused'),
 (['~$ch12.doc',
   '~$part1.doc',
   '~$part2.doc',
   '~$part3.doc',
   '~$part4.doc',
   '~$part5.doc',
   '~$part6.doc',
   '~$part7.doc'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev-etc\\originals\\Unpacked',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\dev-etc\\originals\\Unpacked'),
 (['~$ 1026 L Python Development I 03-20-09.doc', '~WRL1460.tmp'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\examples-official\\1.1\\workingcopy-py31\\PP4E-Examples-1.1\\Examples\\PP4E\\Internet\\Email\\PyMailGui\\altconfigs\\TempParts',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\examples-official\\1.1\\workingcopy-py31\\PP4E-Examples-1.1\\Examples\\PP4E\\Internet\\Email\\PyMailGui\\altconfigs\\TempParts'),
 (['~$ORA.dot'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-email-checkpoint-1\\dev',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-email-checkpoint-1\\dev'),
 (['~$ORA.dot'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-email-checkpoint-2\\dev',
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 (['~$ORA.dot'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-fulldraft-review',
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 (['~$ORA.dot'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-half1-submit\\dev',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-half1-submit\\dev'),
 (['~$ORA.dot'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-half1-submit-0\\dev',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PP4E\\submits\\pp4e-half1-submit-0\\dev'),
 (['~$ch01.doc'],
  'C:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PREF4E\\dev',
  'D:/MY-OTHER-STUFF\\Books-old\\vaiop\\4E\\PREF4E\\dev'),
 (['desktop.ini'],
  'C:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Birgit',
  'D:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Birgit'),
 (['desktop.ini'],
  'C:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Birgit\\Unknown '
  'Album',
  'D:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Birgit\\Unknown '
  'Album'),
 (['desktop.ini'],
  'C:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Rammstein',
  'D:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Rammstein'),
 (['desktop.ini'],
  'C:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Rammstein\\Mutter',
  'D:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Rammstein\\Mutter'),
 (['desktop.ini'],
  'C:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Reise Reise',
  'D:/MY-OTHER-STUFF\\Misc-old\\vaiop\\Itunes-Cut-Feb11\\Reise Reise'),
 (['~$-2012--U-0363-01_P.doc'],
  'C:/MY-OTHER-STUFF\\Misc-old\\vaioz-to-mar1514\\address-labels-2010-2012',
  'D:/MY-OTHER-STUFF\\Misc-old\\vaioz-to-mar1514\\address-labels-2010-2012')]
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UNIQUE ITEMS IN DIRFROM: (names, dirfrom, dirto)
**These items will be copied over to dirto by automatic resolution**

[]
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MIXED MODE NAMES: (name, dirfrom, dirto)
**These items will be replaced in dirto by automatic resolution**

[]
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*Summary
Compared    => files: 39502, folders: 3987
Differences => samefile: 0, uniqueto: 40, uniquefrom: 0, mixedmode: 0
Changed:
files   => created: 0, deleted: 0, replaced: 0
folders => created: 0, deleted: 0, replaced: 0
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Finished.