I have just upgraded several hard drives on our Synology, and now have 2 bare metal drives of smaller capacity (6TB) that I'd like to reuse on my Mac for other purposes. However I can't seem to get them reformatted for use with the Mac: I am only able to reclaim 1.6TB of the original 6TB (WD Red drive)
Here is how they show up initially:
/dev/disk9 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.6 TB disk9 1: Linux_RAID 2.6 GB disk9s1 2: Linux_RAID 2.1 GB disk9s2
This adds up to about 6TB, and makes sense to see the
Linux_RAID partition types given that I pulled these from Synology.
However after reformatting using Disk Utility, I only see a 1.6TB drive, which is confirmed when I do a
/dev/disk9 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.6 TB disk9 1: EFI EFI 209.7 MB disk9s1 2: Apple_HFS Untitled 1.6 TB disk9s2
I've tried various combinations of reformatting from the command line, as well [this question] (including
diskutil eraseDisk), to no avail. I always seem to end up with a single 1.6TB partition.
Any suggestions on how to fully wipe and reformat the drive to get access to the full capacity?
EDIT: trying to reclaim the partition space did not work either (note that after a reboot, the disk in question is now
➜ ~ diskutil partitionDisk disk5 1 GPT HFS+ MacintoshHD 100% Started partitioning on disk5 Unmounting disk Creating the partition map Waiting for partitions to activate Formatting disk5s2 as Mac OS Extended with name MacintoshHD Initialized /dev/rdisk5s2 as a 1 TB case-insensitive HFS Plus volume Mounting disk Finished partitioning on disk5 /dev/disk5 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.6 TB disk5 1: EFI EFI 209.7 MB disk5s1 2: Apple_HFS MacintoshHD 1.6 TB disk5s2
EDIT2: getting details on the disk in question:
➜ ~ system_profiler SPStorageDataType | egrep disk5 -B 10 -A 10 MacintoshHD: Free: 1.6 TB (1,602,103,631,872 bytes) Capacity: 1.6 TB (1,602,784,641,024 bytes) Mount Point: /Volumes/MacintoshHD File System: HFS+ Writable: Yes Ignore Ownership: Yes BSD Name: disk5s2 Volume UUID: 96706824-36D6-37F5-BEC0-E8D7BAA06E9B Physical Drive: Device Name: External Media Name: Generic External Media Protocol: USB Internal: No Partition Map Type: GPT (GUID Partition Table)