Hello!I have flash storage with exFAT filesystem and I need to get it filesystem UUID. How can I do it programmatically?I attempt to get it via ioreg, and I think that Filesystem UUID is "Content" property of partition. Below we can think that filesystem UUID is EBD0A0A2-B9E5-4433-87C0-68B6B72699C7.+-o IOBlockStorageServices <class IORegistryEntry:IOService:IOBlockStorageDevice:IOBlockStorageServices, id 0x10000129c, registered, matched, active, busy 0 (73 ms), retain 6> | { | "IOMinimumSegmentAlignmentByteCount" = 4 | "device-type" = "Generic" | "Protocol Characteristics" = {"Physical Interconnect"="USB","Read Time Out Duration"=30000,"SCSI Logical Unit Number"=0,"Physical Interconnect Location"="External","Write Time Out Duration"=30000,"Retry Count"=20} | "Device Characteristics" = {"Vendor Name"="Kingston","Product Name"="DataTraveler 2.0","Product Revision Level"="1.00"} | } | +-o IOBlockStorageDriver <class IORegistryEntry:IOService:IOStorage:IOBlockStorageDriver, id 0x10000129d, registered, matched, active, busy 0 (72 ms), retain 8> | { | "IOPropertyMatch" = {"device-type"="Generic"} | "CFBundleIdentifier" = "com.apple.iokit.IOStorageFamily" | "IOProviderClass" = "IOBlockStorageDevice" | "IOClass" = "IOBlockStorageDriver" | "IOProbeScore" = 0 | "CFBundleIdentifierKernel" = "com.apple.iokit.IOStorageFamily" | "Statistics" = {"Operations (Write)"=338,"Latency Time (Write)"=0,"Bytes (Read)"=532992,"Errors (Write)"=0,"Total Time (Read)"=147844763,"Latency Time (Read)"=0,"Retries (Read)"=0,"Errors (Read)"=0,"Total Time (Write)"=3660822621,"Bytes (Write)"=1882624,"Operations (Read)"=101,"Retries (Write)"=0} | "IOMatchCategory" = "IODefaultMatchCategory" | "IOGeneralInterest" = "IOCommand is not serializable" | } | +-o Kingston DataTraveler 2.0 Media <class IORegistryEntry:IOService:IOStorage:IOMedia, id 0x1000012b3, registered, matched, active, busy 0 (72 ms), retain 12> | { | "Content" = "GUID_partition_scheme" | "Removable" = Yes | "Whole" = Yes | "Leaf" = No | "BSD Name" = "disk2" | "Ejectable" = Yes | "Preferred Block Size" = 512 | "IOMediaIcon" = {"IOBundleResourceFile"="Removable.icns","CFBundleIdentifier"="com.apple.iokit.IOStorageFamily"} | "BSD Minor" = 9 | "IOGeneralInterest" = "IOCommand is not serializable" | "Writable" = Yes | "BSD Major" = 1 | "Size" = 15500574720 | "IOBusyInterest" = "IOCommand is not serializable" | "Open" = Yes | "Content Hint" = "" | "BSD Unit" = 2 | } | +-o IOMediaBSDClient <class IORegistryEntry:IOService:IOMediaBSDClient, id 0x1000012b8, registered, matched, active, busy 0 (0 ms), retain 6> | { | "IOProbeScore" = 30000 | "CFBundleIdentifier" = "com.apple.iokit.IOStorageFamily" | "IOMatchCategory" = "IOMediaBSDClient" | "IOClass" = "IOMediaBSDClient" | "IOProviderClass" = "IOMedia" | "CFBundleIdentifierKernel" = "com.apple.iokit.IOStorageFamily" | "IOResourceMatch" = "IOBSD" | } | +-o IOGUIDPartitionScheme <class IORegistryEntry:IOService:IOStorage:IOPartitionScheme:IOGUIDPartitionScheme, id 0x1000012ba, !registered, !matched, active, busy 0 (0 ms), retain 6> | { | "IOProbeScore" = 4000 | "IOPropertyMatch" = {"Whole"=Yes} | "IOMatchCategory" = "IOStorage" | "IOClass" = "IOGUIDPartitionScheme" | "IOProviderClass" = "IOMedia" | "CFBundleIdentifier" = "com.apple.iokit.IOStorageFamily" | "CFBundleIdentifierKernel" = "com.apple.iokit.IOStorageFamily" | "UUID" = "DB6A5DED-C145-4F28-B80E-5DA726D76AF2" | "Content Mask" = "GUID_partition_scheme" | } | +-o Microsoft Basic Data@1 <class IORegistryEntry:IOService:IOStorage:IOMedia, id 0x1000012be, registered, matched, active, busy 0 (0 ms), retain 11> | { | "Open" = Yes | "Preferred Block Size" = 512 | "Base" = 1048576 | "Writable" = Yes | "IOBusyInterest" = "IOCommand is not serializable" | "Size" = 15499509248 | "Content" = "EBD0A0A2-B9E5-4433-87C0-68B6B72699C7" | "BSD Minor" = 10 | "Whole" = No | "Removable" = Yes | "UUID" = "E704A750-5562-4578-9F97-D4D0E0326C7A" | "BSD Unit" = 2 | "BSD Major" = 1 | "Ejectable" = Yes | "BSD Name" = "disk2s1" | "Partition ID" = 1 | "IOGeneralInterest" = "IOCommand is not serializable" | "GPT Attributes" = 0 | "Content Hint" = "EBD0A0A2-B9E5-4433-87C0-68B6B72699C7" | "Leaf" = Yes | } | +-o IOMediaBSDClient <class IORegistryEntry:IOService:IOMediaBSDClient, id 0x1000012bf, registered, matched, active, busy 0 (0 ms), retain 7> { "IOProbeScore" = 30000 "CFBundleIdentifier" = "com.apple.iokit.IOStorageFamily" "IOMatchCategory" = "IOMediaBSDClient" "IOClass" = "IOMediaBSDClient" "IOProviderClass" = "IOMedia" "CFBundleIdentifierKernel" = "com.apple.iokit.IOStorageFamily" "IOResourceMatch" = "IOBSD" }BUT when I try to check it via diskutil, I've get two ID's with similiar names - volume, disk/partition:diskutil info disk2s1 | grep UUID Volume UUID: C1E39943-2F19-369A-A22F-11027887EBC8 Disk / Partition UUID: E704A750-5562-4578-9F97-D4D0E0326C7AAnd one of these UUIDs is not present in ioreg output - C1E39943-2F19-369A-A22F-11027887EBC8. Very interesting. I'd check in Disk Utility (with GUI) and in information about partition I see that (Filesystem UUID: C1E39943-2F19-369A-A22F-11027887EBC8):https://i.ibb.co/pKrqs3r/Screenshot-2020-02-11-at-10-45-34.pngAnd for more information here is output of blkid in Linux:sudo blkid /dev/sdf1/dev/sdf1: LABEL="exFAT" UUID="9CAD-0C6D" TYPE="exfat" PARTLABEL="Microsoft Basic Data" PARTUUID="e704a750-5562-4578-9f97-d4d0e0326c7a"We can see that partition UUID is equal, but filesystem UUID - is not.Someone can explain me:1. how I can get Filesystem UUID of volume programmatically?2. why results in Linux and macOS are different?3. why in some places C1E39943-2F19-369A-A22F-11027887EBC8 is Volume UUID, but in some places - Filesystem UUID? After all It really different things!Thanks!