UsbLinuxPartitionManager

Ensures a labeled data partition exists on the USB boot disk at runtime. USB sticks are flashed by Rufus producing a 2-partition layout (FAT32 ESP + NTFS). This class creates a new partition by shrinking the largest (NTFS data) partition and formatting the freed space with the requested filesystem and label, optionally assigning a drive letter. Windows equivalent of BootISOGrub2.PrepareUsbIsoPartition (Linux side).

public static class UsbLinuxPartitionManager

1. Methods

1.1. EnsureUsbDataPartition(ISystemHost, IDisk, DataSize, string, string, bool)

Ensures a partition with the given label exists on the USB disk, formatted with fileSystem. Idempotent: if the partition already exists, its drive letter (if requested) is re-assigned and returned without touching the disk layout.

public static char? EnsureUsbDataPartition(ISystemHost host, IDisk usbDisk, DataSize requiredSize, string label, string fileSystem, bool assignDriveLetter)

Table 1. Parameters
Name	Type	Description
host	ISystemHost	System host for logging and disk refresh.
usbDisk	IDisk	The USB disk to modify (resolved by caller via drive letter match).
requiredSize	DataSize	Size to carve out of the largest partition.
label	string	Volume label for the new partition (e.g. `SYSTEM`).
fileSystem	string	Filesystem to format with (`ntfs` or `fat32`).
assignDriveLetter	bool	If `true`, assigns the first free drive letter and returns it.

Returns: char? — The assigned drive letter if assignDriveLetter is true, otherwise null.