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WinFsp-MemFs-Extended is invoked using the memefs command with various options to configure the RAM disk behavior.

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Usage syntax

memefs OPTIONS

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Required options

At minimum, you must specify either a mount point (-m) for disk mode or a UNC prefix (-u) for network mode.

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Command-line flags

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-s MaxFsSize

Type: Integer (64-bit) Default: 0 (unlimited) Description: Specifies the maximum total memory size for the filesystem in bytes. If not specified or set to 0, the filesystem has no memory limit. 
memefs -s 1073741824 -m R:
This creates a 1GB RAM disk. You can specify the value in bytes or use hexadecimal notation (e.g., 0x40000000).

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-m MountPoint

Type: String Default: None Description: Specifies the drive letter or mount point for the RAM disk. Use * to automatically select an available drive letter. Required if no UNC prefix is specified. 
memefs -s 1073741824 -m R:
memefs -s 1073741824 -m *

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-i

Type: Flag (no value) Default: Case-sensitive Description: Enables case-insensitive file system behavior. When enabled, files like README.txt and readme.txt are treated as the same file. 
memefs -s 1073741824 -m R: -i

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-f

Type: Flag (no value) Default: Disabled Description: Enables flush and purge cache on cleanup. This ensures that file system buffers are flushed and purged when files are closed. 
memefs -s 1073741824 -m R: -f

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-F FileSystemName

Type: String Default: System default Description: Specifies the file system name reported to Windows. This affects how the file system appears in system properties and tools. 
memefs -s 1073741824 -m R: -F NTFS

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-l VolumeLabel

Type: String Default: None Description: Sets an optional volume label name for the RAM disk. This label appears in File Explorer and system tools. 
memefs -s 1073741824 -m R: -l "Ram Disk"

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-u \Server\Share

Type: String (UNC path) Default: None Description: Specifies a UNC prefix for network mode. Use a single backslash in the actual command. When specified, the filesystem operates in network mode instead of disk mode. 
memefs -s 1073741824 -u \\Server\\RamDisk

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-S RootSddl

Type: String (SDDL) Default: None Description: Specifies Security Descriptor Definition Language (SDDL) for root directory permissions. Use file rights like FA (File All Access). Generic rights like GA are not supported. 
memefs -s 1073741824 -m R: -S "D:P(A;;FA;;;WD)"

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-d DebugFlags

Type: Integer Default: 0 (no debug output) Description: Enables debug logging with specified flags. Use -1 to enable all debug logs. 
memefs -s 1073741824 -m R: -d -1

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-D DebugLogFile

Type: String (file path) Default: None Description: Specifies a file path for debug log output. Use - to output to stderr. 
memefs -s 1073741824 -m R: -D C:\Logs\memefs.log
memefs -s 1073741824 -m R: -D -

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-?

Type: Flag (no value) Description: Displays usage information and exits. 
memefs -?

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Common flag combinations

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Basic RAM disk

memefs -s 2147483648 -m R:

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Case-insensitive RAM disk with volume label

memefs -s 1073741824 -m R: -i -l "RAM Drive"

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NTFS-compatible RAM disk

memefs -s 1073741824 -m R: -i -F NTFS -l Ram

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Network RAM disk with UNC path

memefs -s 1073741824 -u \\Server\\Share -i

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