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I have a 1 TB NTFS HDD which has 350GB free space, how would I format that 350GB to use it as a backup space for my MacBook?

diskutil list output:

/dev/disk1 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *1.0 TB     disk1
   1:               Windows_NTFS ADATA HD710             1.0 TB     disk1s1
  • Is the 350 GB partitioned separately or a part of a single drive?? – killswitch Mar 31 '16 at 21:16
  • Not partitioned just a single one. – wertvoll Mar 31 '16 at 21:18
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    Unless you create a separate partition you can't format the drive, as it will remove the rest of the data as well. The only option you can use it, copy the data on a temporary drive, make a partition, copy back the data, and then use it as a Back up drive for time machine. – killswitch Mar 31 '16 at 21:21
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    With assumption of having Tuxera NTFS installed which gives ability to read/write, can you suggest a way? – wertvoll Mar 31 '16 at 21:41
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    @DavidAnderson I found GParted for doing this on Mac because i do not have access to a Windows machine, I'll give it a try. Thank you. – wertvoll Mar 31 '16 at 22:16
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  1. If you've already got GParted, use ´GParted /dev/disk1´ to resize your NTFS partition. It has a nice Graphical front-end, and just in case you need it, here is the manual.
  2. As David Anderson said a couple times, above, then you can open the OSX application Disk Utility, which is under /Applications/Utilities, and then you will see empty space on that disk:
  3. Create a partition of the type HFS+ (journaled), and you'll be ready to use it as your Time Machine disk.

I think you'll be finished in no time, since you personally already found Gparted, and sound like you have good information about this. You would also be able to do this all on the command-line is OSX with diskutil.

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    I finally done that, But the easiest way to backup on a NTFS Drive is using CCC(Carbon Copy Cloner) along with it's amazing settings. – wertvoll Apr 1 '16 at 13:31
  • Did you use the gparted live CD? or it sounded before like you had actually a port of parted/gparted... I'd like to clarify my answer for the future then. – forgotstackxpassword Apr 1 '16 at 18:15
  • @wertvoll thanks for the tip on CCC; excellent name! ...if that is the best answer, maybe write it up as your own answer, or check the above one as "solved." – forgotstackxpassword Apr 1 '16 at 18:17

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