Q: 80gb of HD space disappeared after partitioning

Yes, if the HD is directly connected to the Mac and formatted appropriately for TM to use as a backup disk.

Yes, it will, as long as the TM drive is larger than your internal disk.

Please see Backup disks you can use with Time Machine - Apple Support and Use Time Machine to back up or restore your Mac - Apple Support .

No worries. . Please ensure you have about 150-200GB in a partition formatted as MAC OSX Extended Journaled.

Had the same issue just fixed it without having to restore everything. The trick is use in terminal: diskutil resizevolume disk0s2 R

Before doing this you might need to get root privileges: sudo -v

Enter your password and just then after: diskutil resizevolume disk0s2 R

(R stands to the size of the drive at its fullest without having you to type 512.xx gb etc)

Did you have Free Space in the LVG? Did you have a CS volume/volume group?

I have a Macbook Pro Retina mounting 512gb SSD. Had two partitions: Mac (400gb) and Windows 8.1 the rest.

Today I wanted to update to 10 with clean installation. I deleted the partition but that space was not added up to my main partition.

Therefore it was vacant and could not use it in any way. Tried several methods only that worked was the one I described above.

I had about 30gb free at the moment of the operation plus 100gb that would not show up anywhere!! Disk Utility would show only one 400gb partition and the remaining 100 were free but in some mysterious location.

sudo -v

yourpasswordhere

diskutil resizevolume disk0s2 R

for a better understanding of how resizeVolume works only type diskutil resizeVolume on terminal

Can you post the output of diskutil cs list and GPT from your Mac?

diskutil resizeVolume

Usage:  diskutil resizeVolume MountPoint|DiskIdentifier|DeviceNode size

        [part1Format part1Name part1Size part2Format part2Name part2Size

         part3Format part3Name part3Size ...]

 

Non-destructively resize a disk.  You may increase or decrease its size.

 

When decreasing size, you may optionally specify new partitions to create

to fill the newly-freed space.  Specify these new partitions as in the

diskutil partitionDisk command.  A size of zero will cause a grow fit-to-fill.

Ownership of the affected disk is required.

 

Valid sizes are floating-point numbers with a suffix of B(ytes), S(512-byte-

blocks), K(ilobytes), M(egabytes), G(igabytes), T(erabytes), P(etabytes),

or (%)percentage of the total size of the whole disk.

 

A size of "limits" will print the valid range for the current conditions of

the file system and room to grow up to an immovable object (next partition).

 

A size of "R" for the target partition will resize it to the maximum

possible; "R" cannot be used for the size of new partition triples, if any.

 

resizeVolume is only supported on a Journaled HFS+ file system.

 

diskutil cs resizeVolume

Usage:  diskutil coreStorage resizeVolume

        lvUUID|MountPoint|DiskIdentifier|DeviceNode size

Resize a logical volume, which is one of one or more disks that consume storage

out of a logical volume group. The logical volume group will have more or less

available space after this operation, if it was a shrink or grow, respectively.

Example: diskutil coreStorage resizeVolume

         11111111-2222-3333-4444-555555555555 10g

 

diskutil resizeVolume disk0s2 limits

For device disk0s2 Macintosh HD:

        Current size:  741.7 GB (741695819776 Bytes)

        Minimum size:  690.4 GB (690367602688 Bytes)

        Maximum size:  741.7 GB (741695819776 Bytes)

First of all I had unlocked the vault.

Then tried on disk utility, recovery, bootcamp nothing worked. Then moved over terminal tried some other ways this was the only effective one.

After running resize just did diskutil list and everything is fine now! Properly resized. Did not reboot as I have some processes going on in fact on Disk utility still says: hard drive disk0 500gb and disk0s2 400 while on terminal or Cmd+I on Mac HD it says 499 GB and correct empty space! Hope to have been helpful here.

Thanks for posting the details Lorenz_MC. Very helpful.

When you have Free Space and a JHFS+ volume it works as expected. If there is a trailing volume, the resize will get maximized to available till it hits next partition. In case of CoreStorage, the volume needs to be reverted back to JHFS+ to make it work.

:~ $ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MacHD                   499.8 GB   disk0s2

:~ $ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MacHD                   439.8 GB   disk0s2

   3:                  Apple_HFS JHFS2                   59.9 GB    disk0s3

:~ $ diskutil resizeVolume disk0s2 limits

For device disk0s2 MacHD:

        Current size:  439.8 GB (439763886080 Bytes)

        Minimum size:  69.7 GB (69709271040 Bytes)

        Maximum size:  439.8 GB (439763886080 Bytes)

:~ $ diskutil eraseVolume free MyFree disk0s3

Started erase on disk0s3 JHFS2

Unmounting disk

Error: 2: POSIX reports: No such file or directory

:~ $ diskutil resizeVolume disk0s2 limits

For device disk0s2 MacHD:

        Current size:  439.8 GB (439763886080 Bytes)

        Minimum size:  69.7 GB (69707804672 Bytes)

        Maximum size:  499.8 GB (499763888128 Bytes)

:~ $ sudo gpt -vv -r show disk0

Password:

gpt show: disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: disk0: PMBR at sector 0

gpt show: disk0: Pri GPT at sector 1

gpt show: disk0: Sec GPT at sector 976773167

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  858913840      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  859323480  117449655        

  976773135         32         Sec GPT table

  976773167          1         Sec GPT header

:~ $ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MacHD                   439.8 GB   disk0s2

:~ $ diskutil resizeVolume disk0s2 limits

For device disk0s2 MacHD:

        Current size:  439.8 GB (439763886080 Bytes)

        Minimum size:  69.4 GB (69406040064 Bytes)

        Maximum size:  499.8 GB (499763888128 Bytes)

 

:~ $ diskutil resizeVolume disk0s2 R

Started partitioning on disk0s2 MacHD

Verifying the disk

Checking file system

Performing live verification

Checking Journaled HFS Plus volume

Checking extents overflow file

Checking catalog file

Checking multi-linked files

Checking catalog hierarchy

Checking extended attributes file

Checking volume bitmap

Checking volume information

The volume MacHD appears to be OK

Resizing

Finished partitioning on disk0s2 MacHD

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MacHD                   499.8 GB   disk0s2

:~ $ sudo gpt -vv -r show disk0

gpt show: disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: disk0: PMBR at sector 0

gpt show: disk0: Pri GPT at sector 1

gpt show: disk0: Sec GPT at sector 976773167

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  976101344      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  976510984     262151        

  976773135         32         Sec GPT table

  976773167          1         Sec GPT header

:~ $ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MacHD                   499.8 GB   disk0s2

:~ $ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MacHD                   439.8 GB   disk0s2

   3:                  Apple_HFS JHFS2                   59.9 GB    disk0s3

/dev/disk1

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            MFEMA                  *9.4 MB     disk1

:~ $ diskutil resizeVolume disk0s2 limits

For device disk0s2 MacHD:

        Current size:  439.8 GB (439763886080 Bytes)

        Minimum size:  69.3 GB (69307838464 Bytes)

        Maximum size:  439.8 GB (439763886080 Bytes)

:~ $ diskutil resizeVolume disk0s2 R

Started partitioning on disk0s2 MacHD

Verifying the disk

Checking file system

Checking Journaled HFS Plus volume

Checking extents overflow file

Checking catalog file

Checking multi-linked files

Checking catalog hierarchy

Checking extended attributes file

Checking volume bitmap

Checking volume information

The volume MacHD appears to be OK

Resizing

Finished partitioning on disk0s2 MacHD

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                  Apple_HFS MacHD                   439.8 GB   disk0s2

   3:                  Apple_HFS JHFS2                   59.9 GB    disk0s3

Glad to see it working. . Please backup OSX and Windows. Use separate external disks, if possible.

I tried using this method and I keep getting "Volume format does not support resizing" every time I enter diskutil resizeVolume disk0s2 R

I'm not sure the reason why...

ah, never mind. I think it's because I was decrypting while I was trying to resize.