->diskutil list

/dev/disk5 (external, physical):
Â Â  #: Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  TYPE NAMEÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  SIZE Â  Â  Â  IDENTIFIER
Â Â  0: Â  Â  FDisk_partition_schemeÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  *8.0 TB Â  Â  disk5
Â Â  1: Â  Â  Â  Â  Â  Â  Â  Windows_NTFS â ¨8lerâ ©Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  8.0 TB Â  Â  disk5s1

Hier steht Windows_NTFS? ExFat ist eine Mischform aus NTFS und FAT

Â diskutil info disk5
Â Â  Device Identifier: Â  Â  Â  Â  disk5
Â Â  Device Node: Â  Â  Â  Â  Â  Â  Â  /dev/disk5
Â Â  Whole: Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Yes
Â Â  Part of Whole: Â  Â  Â  Â  Â  Â  disk5
Â Â  Device / Media Name: Â  Â  Â  External USB 3.0

Â Â  Volume Name: Â  Â  Â  Â  Â  Â  Â  Not applicable (no file system)
Â Â  Mounted: Â  Â  Â  Â  Â  Â  Â  Â  Â  Not applicable (no file system)
Â Â  File System: Â  Â  Â  Â  Â  Â  Â  None

Â Â  Content (IOContent): Â  Â  Â  FDisk_partition_scheme
Â Â  OS Can Be Installed: Â  Â  Â  No
Â Â  Media Type:Â  Â  Â  Â  Â  Â  Â  Â  Generic
Â Â  Protocol:Â  Â  Â  Â  Â  Â  Â  Â  Â  USB
Â Â  SMART Status:Â  Â  Â  Â  Â  Â  Â  Not Supported

Â Â  Disk Size: Â  Â  Â  Â  Â  Â  Â  Â  8.0 TB (8001563222016 Bytes) (exactly 15628053168 512-Byte-Units)
Â Â  Device Block Size: Â  Â  Â  Â  4096 Bytes

Â Â  Media OS Use Only: Â  Â  Â  Â  No
Â Â  Media Read-Only: Â  Â  Â  Â  Â  No
Â Â  Volume Read-Only:Â  Â  Â  Â  Â  Not applicable (no file system)

Â Â  Device Location: Â  Â  Â  Â  Â  External
Â Â  Removable Media: Â  Â  Â  Â  Â  Fixed

Â Â  Solid State: Â  Â  Â  Â  Â  Â  Â  Info not available
Â Â  Virtual: Â  Â  Â  Â  Â  Â  Â  Â  Â  No

diskutil info disk5s1

Â Â  Device Identifier: Â  Â  Â  Â  disk5s1
Â Â  Device Node: Â  Â  Â  Â  Â  Â  Â  /dev/disk5s1
Â Â  Whole: Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  No
Â Â  Part of Whole: Â  Â  Â  Â  Â  Â  disk5

Â Â  Volume Name: Â  Â  Â  Â  Â  Â  Â  8ler
Â Â  Mounted: Â  Â  Â  Â  Â  Â  Â  Â  Â  No

Â Â  Partition Type:Â  Â  Â  Â  Â  Â  Windows_NTFS
Â Â  File System Personality: Â  ExFAT
Â Â  Type (Bundle): Â  Â  Â  Â  Â  Â  exfat
Â Â  Name (User Visible): Â  Â  Â  ExFAT

Â Â  OS Can Be Installed: Â  Â  Â  No
Â Â  Media Type:Â  Â  Â  Â  Â  Â  Â  Â  Generic
Â Â  Protocol:Â  Â  Â  Â  Â  Â  Â  Â  Â  USB
Â Â  SMART Status:Â  Â  Â  Â  Â  Â  Â  Not Supported
Â Â  Volume UUID: Â  Â  Â  Â  Â  Â  Â  854F698B-33F6-31BE-9048-BFC42DF6A04A
Â Â  Partition Offset:Â  Â  Â  Â  Â  1048576 Bytes (256 4096-Byte-Device-Blocks)

Â Â  Disk Size: Â  Â  Â  Â  Â  Â  Â  Â  8.0 TB (8001551335424 Bytes) (exactly 15628029952 512-Byte-Units)
Â Â  Device Block Size: Â  Â  Â  Â  4096 Bytes

Â Â  Volume Total Space:Â  Â  Â  Â  0 B (0 Bytes) (exactly 0 512-Byte-Units)
Â Â  Volume Free Space: Â  Â  Â  Â  0 B (0 Bytes) (exactly 0 512-Byte-Units)

Â Â  Media OS Use Only: Â  Â  Â  Â  No
Â Â  Media Read-Only: Â  Â  Â  Â  Â  No
Â Â  Volume Read-Only:Â  Â  Â  Â  Â  Not applicable (not mounted)

Â Â  Device Location: Â  Â  Â  Â  Â  External
Â Â  Removable Media: Â  Â  Â  Â  Â  Fixed

Â Â  Solid State: Â  Â  Â  Â  Â  Â  Â  Info not available

wenn ich folgendes mache
diskutil mount disk5s1Â  Â  Â  Â 

Volume on disk5s1 failed to mount

If you think the volume is supported but damaged, try the "readOnly" option

im Anschluss prÃ¼fe ich das Laufwerk: 
diskutil VerifyVolume disk5s1

Note: Your partition map does not use the entire space of your whole-disk. You should use repairDisk.
Started file system verification on disk5s1 (8ler)
Verifying file system
Volume is already unmounted
Performing fsck_exfat -n -x /dev/rdisk5s1
Checking volume
Checking main boot region
Checking system files
Volume name is 8ler
Checking upper case translation table
Checking file system hierarchy
Checking active bitmap
Rechecking main boot region
Rechecking alternate boot region
The volume 8ler appears to be OK
File system check exit code is 0
Restoring the original state found as unmounted
Finished file system verification on disk5s1 (8ler)

RepairVolume danach selbes.. 

Ã ber Windows sind die Daten vorhanden und auch lesbar. ich habe dann Ã¼berlegt, Windows_NTFS ob das daran legen kÃ¶nnte.

diskutil listFilesystems
Formattable file systems

These file system personalities can be used for erasing and partitioning.
When specifying a personality as a parameter to a verb, case is not considered.
Certain common aliases (also case-insensitive) are listed below as well.

-------------------------------------------------------------------------------
PERSONALITY Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  USER VISIBLE NAMEÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
-------------------------------------------------------------------------------
Case-sensitive APFS Â  Â  Â  Â  Â  Â  APFS (Case-sensitive)Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
Â  (or) APFSX
APFSÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  APFS Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
Â  (or) APFSI
ExFAT Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  ExFATÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
Free SpaceÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Freier Speicherplatz Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
Â  (or) FREE
MS-DOSÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  MS-DOS (FAT) Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
MS-DOS FAT12Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  MS-DOS (FAT12) Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
MS-DOS FAT16Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  MS-DOS (FAT16) Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
MS-DOS FAT32Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  MS-DOS (FAT32) Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
Â  (or) FAT32
HFS+Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Mac OS ExtendedÂ  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
Case-sensitive HFS+ Â  Â  Â  Â  Â  Â  Mac OS Extended (Case-sensitive) Â  Â  Â  Â  Â  Â  Â  Â 
Â  (or) HFSX
Case-sensitive Journaled HFS+ Â  Mac OS Extended (Case-sensitive, Journaled)Â  Â  Â 
Â  (or) JHFSX
Journaled HFS+Â  Â  Â  Â  Â  Â  Â  Â  Â  Mac OS Extended (Journaled)Â  Â  Â  Â  Â  Â  Â  Â  Â  Â  Â 
Â  (or) JHFS+