Folks have reported reasonably good success with most SDHC (and SDXC?) cards, though I believe there are a few brands/models out there that have been problematic. Will try keep a list here of brands/models that users have had success/difficulties with:
...
Stick to big-brands (SanDisk / Kingston)
SDHCis recommended
WARNING: some SDXC cards work, others don’t
WARNING#2: don’t use plain SD / SDSC card, they don’t work
Aim for 32GB or lessa minimum of 4GB and a maximum of 32GB
Brand/Model | Experience | User |
|---|---|---|
Onn 128GB | Not working - Gets stuck in mega65-fdisk somewhere within  | traymond |
Kingston 256GB SDXC | Ok - recognised by MEGA65 as 128GB card, but works (discord) | Goetholon |
Team 8GB SDHC (class 4)  | Good (discord) | Lydon |
SanDisk Extreme 32GB SDHC (v30 I)  | Good (discord) | Lydon |
SanDisk Extreme 128GB SDXC (v30 I)  | Good (discord) | Lydon |
PNY 32GB SDHC | Not working -
| Yaru |
Kingston 32GB (SDHC?) | Ok - Yaru mentioned that his SD-card would sometimes fail to be detected as SDHC, but he found the problem went away after using a HDMI splitter (discord) | Yaru |
...