If your Windows 7 PC runs on UEFI firmware or uses NVMe/RAID controllers, the DOS method will fail. You need WinPE (Windows Preinstallation Environment) with Ghost32.exe, which supports AHCI, USB 3.0, and NTFS natively.

Pros: Extremely fast on old hardware, very small USB footprint.
Cons: Cannot see GPT disks or UEFI systems. Limited to SATA in IDE mode (may need to change BIOS from AHCI to IDE).

Pros: Supports UEFI, GPT, AHCI, USB 3.0, network imaging (-ja option).
Cons: Complex setup, requires 4GB+ USB, slower boot than DOS.

For better hardware support (e.g., SATA drives in AHCI mode), create a Windows PE 3.0 (based on Windows 7) USB and run Ghost from there.