TRD images on HDD

[Adramelek]

What format of HDD use russian clones ? (smuc interface, etc...)

ATM, NEMO (2 different formats), and SMUC.

Is supported only TRD images ?

No, not only TRD. Some clones (such as ATM Turbo 2+, Profi...) have support of CP/M. Also OS TASiS was developed (only for ATM). IS-DOS can be installed on almost every russian clone (exclude weird old ones). All this OS' support HDD and have they own file system. It's possible to keep TRD images on HDD and run it when you want to. In case of ATM you can put TRD image on RAM disk and start special version of TR-DOS which supports RAM disk.