Chevels (./23):
Hi !
Great this interface ! On the other hand, it has been a long time since I touched my STE and above all I have never used a hard drive on my various STEs. I have always done the old fashioned way^^
So I have a noob question: what types of hard drives can be used on a STE with this interface? (IDE, ACSI, maximum capacity...). I guess it's ACSI but are such hard drives still in 2021 ??

As friend Fadest illustrates...

You only need a micro SD card; this device lets use any micro SD card as a compatible hard disk for your STE machine; as well the micro SD card is also readable under Windows / Linux.
(You can use your PC to copy / read content to the SD card, an use the copied content in your Atari STE)