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Hi. First, I created AppleRAID JBOD using two 8TB hdd. (choose APFS filesystem and generated single 16TB container.) Then, I tried to added another hdd drives. But, diskutility apps says 'Operation is failed because can't expand volume'. However, new drive is already joined JBOD members. So, I can't expand container volume and also can't remove new JBOD member drive. Is there solution? This is my appleRAID info. And the result when I tried to remove devices. AppleRAID sets (1 found) =============================================================================== Name:                 Media HDs Unique ID:            B4CDA256-EA0C-49B7-BDB6-C36D0ACFEC09 Type:                 Concat Status:               Online Size:                 24.0 TB (24002991390720 Bytes) Rebuild:              manual Device Node:          disk12 DevNode   UUID                                  Status     Size 0  disk7s2   61FC5317-59D6-4317-92AB-70B934DCF0E4  Online     8001219231744 1  disk8s2   038BDC0B-1B0A-4D95-8278-68A6BD12990E  Online     8001219231744 2  disk9s2   62E55A81-A025-4097-AB85-5B4F608E4F2C  Online     3000248991744 3  disk10s2  CE0A7BA3-BEB8-4AA4-8468-6A5CDA9BACEC  Online     2000054943744 4  disk11s2  A3566855-E11C-4843-823D-777EECDACD52  Online     3000248991744 =============================================================================== mike@moon ~ % diskutil appleRAID remove disk11s2 disk12 Started RAID operation on disk12 Can't remove the last partition because the file system isn't resizable Error: -69886: Invalid request