Bootice Manual [portable] -

Inside the ZIP folder, there is a bootice_en.txt . It is short and brutal. Here is the translation:

This usually means the PBR points to the wrong boot file.

: Securely erase data by filling a disk with zeros or random data to prevent recovery. How to Use Common Features Bootice Manual

tab to manually specify or find the Boot Configuration Data file of the active OS to tweak the system booting process. Disk Sector Editing

If your partition table is damaged (e.g., after a failed Linux install): Inside the ZIP folder, there is a bootice_en

Go to Physical Disk > Process MBR (Set to NT 6.x) > Process PBR (Set to BOOTMGR).

At the top of the window, you will see a dropdown menu labeled This lists all storage devices connected to your computer. This is the most important field in the software. : Securely erase data by filling a disk

A GUI-based editor where you can easily change the timeout, default OS, and boot parameters.