rdisk

rdisk is a simple Rust CLI tool to detect the partition scheme of a disk device or disk image file. It checks whether the disk uses MBR (Master Boot Record) or GPT (GUID Partition Table) by reading the raw disk bytes.

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Features

• Detects MBR by checking the boot signature at bytes 510-511 (0x55 0xAA).
• Detects GPT by reading the GPT header signature "EFI PART" at byte 512.
• Returns an error if neither signature is found.

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Usage

Build the program:

cargo build --release

Copy the built binary to /usr/local/bin/rdisk

sudo cp rdisk /usr/local/bin/rdisk

Run the program with the disk device or disk image file as an argument:

sudo rdisk /dev/sda

Example output:

/dev/sda is GPT

/dev/loop6 is MBR