==ROM commands==
* |HDCPM mounts the hard disks and boots CP/M Plus. If [https://www.cpcwiki.eu/forum/amstrad-cpc-hardware/usifac-iimake-your-pc-or-usb-stick-an-hdd-for-amstrad-access-dsk-and-many-more!/ USIfAC II] is used enable the USB disk with the |USB command first. [[File:hdcpm-us-boot.png|framelessthumb|HDCPM boot- booting on USIfAC II]]
* |HDCPMT works like |HDCPM but also utilizes the RTC.
* |HDDPB shows the Disk Parameter Block.