All Ataris, the Milan, the Suska board and MIST. Other Atari compatible platforms may also work but are not officially supported. (Check the compatibility with your hardware with the demo version.)
Atari Megafile, SCSI, IDE, ATAPI and SATA drives, removable media drives (SyQuest, ZIP, JAZ, PD, MOD, SuperDisk/LS-120, ...), SSDs, DOMs, memory cards.
IDE/SATA drives, also those with more than 2 TiB capacity.
Drives and memory cards of up to 1 EiB (Exbibyte). SCSI drives with a capacity > 1 GiB connected to the ACSI bus require a suitable host adapter to use their full capacity, e.g. an adapter by Inventronik, an ICD Link or a LINK96/97. (TOS, MagiC or MiNT can only use 2 TiB. Software using the SCSI Driver and supporting 64 bit sector numbers can access sectors beyond the 2 TiB limit.)
The GigaFile SD card drive (ACSI and SCSI) by Inventronik and the UltraSatan SD card drive (ACSI) by Lotharek.
8 configurable sub-units (LUNs) per SCSI/ACSI device.
Drives/media with physical sector sizes of up to 4096 bytes.
SATA Advanced Format Drives (AFD), in particular 512e and 4Kn hard disk drives.
DVD-RAM, DVD+RW and BD-RE media can be partitioned with a FAT filesystem and can be used like regular removable media.
Because of firmware issues SCSI2SD and notably ACSI2SD are not officially supported. (Also see the firmware issue list in the SCSI2SD release notes.) Verify the compatibility of your firmware with the HDDRIVER demo version.
The CT* and the Afterburner040 for the Falcon are not officially supported, but are known to work in practice.
The SatanDisk is not officially supported. It is recommended to use the UltraSatan or GigaFile instead.