wchanley@Ward-M1-Mac ~ % hdiutil create -help
hdiutil create: create a disk image image
Usage:	hdiutil create <sizespec> <imagepath>
	Size specifiers:
	    -size < ?? | ??b | ??k | ??m | ??g | ??t | ??p | ??e >
	    -sectors <count>
	    -megabytes <count>

	Image options:
	    -library <MKDrivers>
	    -layout <layout>			[GPTSPUD or per -fs]
		MBRSPUD - Single partition - Master Boot Record Partition Map
		SPUD - Single partition - Apple Partition Map
		UNIVERSAL CD - CD/DVD
		NONE - No partition map
		GPTSPUD - Single partition - GUID Partition Map
		SPCD - Single partition - CD/DVD
		UNIVERSAL HD - Hard disk
		ISOCD - Single partition - CD/DVD with ISO data
	    -partitionType <partitionType>	[per -fs]
	    -align <sector alignment>		[8 sectors]
	    -ov

	Filesystem options:
	    -fs <filesystem>
		UDF - Universal Disk Format (UDF)
		MS-DOS FAT12 - MS-DOS (FAT12)
		MS-DOS - MS-DOS (FAT)
		MS-DOS FAT16 - MS-DOS (FAT16)
		MS-DOS FAT32 - MS-DOS (FAT32)
		HFS+ - Mac OS Extended
		Case-sensitive HFS+ - Mac OS Extended (Case-sensitive)
		Case-sensitive Journaled HFS+ - Mac OS Extended (Case-sensitive, Journaled)
		Journaled HFS+ - Mac OS Extended (Journaled)
		ExFAT - ExFAT
		Case-sensitive APFS - APFS (Case-sensitive)
		APFS - APFS
	   -volname <volumename>		["untitled"]
	   -stretch < ?? | ?b | ??k | ??m | ??g | ??t | ??p | ??e > (HFS+)

	New Blank Image options:
	    -type <image type>			[UDIF]
		SPARSEBUNDLE - sparse bundle disk image
		SPARSE - sparse disk image
		UDIF - read/write disk image
		UDTO - DVD/CD master
	   -[no]spotlight		do (not) create a Spotlight™ index

	Image from Folder options:
	   -srcfolder <source folder>
	   -[no]spotlight		do (not) create a Spotlight™ index
	   -[no]anyowners		do (not) attempt to preserve owners
	   -[no]skipunreadable		do (not) skip unreadable objects [no]
	   -[no]atomic		do (not) copy to temp location and then rename [yes]
	   -srcowners on|off|any|auto [auto]
	   		on	enable owners on source
	   		off	disable owners on source
	   		any	leave owners state on source unchanged
	   		auto	enable owners if source is a volume
	   -format <image type>			[UDZO]
		UDRO - read-only
		UDCO - compressed (ADC)
		UDZO - compressed
		UDBZ - compressed (bzip2), deprecated
		ULFO - compressed (lzfse)
		ULMO - compressed (lzma)
		UFBI - entire device
		IPOD - iPod image
		UDSB - sparsebundle
		UDSP - sparse
		UDRW - read/write
		UDTO - DVD/CD master
		UNIV - hybrid image (HFS+/ISO/UDF)
		SPARSEBUNDLE - sparse bundle disk image
		SPARSE - sparse disk image
		UDIF - read/write disk image
		UDTO - DVD/CD master

	Image from Device options:
	Note: Filesystem options (-fs, -volname, -stretch) ignored with -srcdevice
	   -srcdevice <source dev node, e.g. disk1, disk2s1>
	   -format <image type>			[UDZO]
		UDRO - read-only
		UDCO - compressed (ADC)
		UDZO - compressed
		UDBZ - compressed (bzip2), deprecated
		ULFO - compressed (lzfse)
		ULMO - compressed (lzma)
		UFBI - entire device
		IPOD - iPod image
		UDSB - sparsebundle
		UDSP - sparse
		UDRW - read/write
		UDTO - DVD/CD master
	    -segmentSize < ?? | ??b | ??k | ??m | ??g | ??t | ??p | ??e > (deprecated)
	                 (sectors, bytes, KiB, MiB, GiB, TiB, PiB, EiB)

	Attach options:
	   -attach			attach image after creation

	Common options:
	    -encryption <crypto method>
	    	AES-128 - 128-bit AES encryption (recommended)
	    	AES-256 - 256-bit AES encryption (more secure, but slower)
	    -stdinpass
	    -agentpass
	    -certificate <path-to-cert-file>
	    -pubkey <public-key-hash>[,pkh2,...]
	    -imagekey <key>=<value>
	    -tgtimagekey <key>=<value>
	    -plist
	    -puppetstrings
	    -verbose
	    -debug
	    -quiet