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SD-cards

SD-cards

Owned by Gurce Isikyildiz
Last updated: Jun 08, 2025

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:

 

General Advice:

  • Stick to big-brands (SanDisk / Kingston / Verbatim)

  • SDHC is recommended

    • WARNING: some SDXC cards work, others don’t

    • WARNING#2: don’t use plain SD / SDSC card, they don’t work

  • Aim for a minimum of 4GB and a maximum of 32GB

Brand/Model

Experience

User

Brand/Model

Experience

User

Onn 128GB

Not working - Gets stuck in mega65-fdisk somewhere within fdisk_hal_mega65.c - sdcard_readspeed_test()

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 (U3 - v30 I)

Good (discord)

Lydon

SanDisk Extreme 128GB SDXC (U3 - v30 I)

Good (discord)

Lydon

PNY 32GB SDHC

Not working -

  • Yaru’s initial post with issue, gets stuck in fdisk on Clearing file system data structures (discord)

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

EMTEC Elite Gold 32GB (SDHC)

Not working for C64 core .d64 files -

The C64 experienced this 2704 error code while trying to browse for .d64 files on the sd-card:

image-20240704-012601.png

(discord thread)

Punishermark

SanDisk Ultra 32GB (SDHC - U1 / C10)

image-20250505-225618.png

 

Good

Amok + deft

(reported privately)

SanDisk Extreme PRO 32GB

(SDHC - U3 / C10)

image-20250505-230440.png

 

Ok - Works fine for most things, but seems to choke on playback of Mirage’s FMV (Full Motion Video) demos.

This from Amok:

(of the SanDisk Ultra Above) funny because it's max write throughput is limited to ~30MO/s while the Extreme PRO version can reach 90M/s.

However The Extreme version just can't sustain the required bandwidth for video streaming demos.

Amok

SanDisk Extreme PLUS 32GB (SDHC - U1)

image-20250505-230923.png

 

 

Ok - I seem to recall it working with FMV (Full Motion Video) demos in the past, but trying it again more recently, no, it’s struggling now :(

Gurce

Lexar 32GB (SDHC - U1)

image-20250607-235007.png

 

Ok - Works fine for most things, but seems to choke on playback of Mirage’s FMV (Full Motion Video) demos.

This from badders73:

I'm on the latest core 0.97 and ROM on a 2024 R6 board. My system simply refuses to play the Duel and Hyper demos. I've tried running them from the Intro 4 disk and mounting them directly. They both get about 20 - 30 seconds in then turn into a garbled mess.

(discord thread)

badders73

Kingston CANVAS Select Plus 16GB
(SDHC U1)

image-20250608-044407.png

 

Good - Plays FMV (Full Motion Video) just fine.

(discord thread)

Gurce

You can confirm the speed of your sd-card via the table here:

 

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