SD cards, and their smaller, more modern replacement, Micro SD, are fairly common, and there are many readers available that will plug into a USB port, and most will handle both types of cards.
An online search such as this should point you to reviews and prices for these...
https://duckduckgo.com/?q=sd+card+reader+usb&t=h_&ia=web
You can pick up a small one (about the size and shape of a USB memory stick) for less than $10.
Gilbert
On 2023-03-10 11:14 a.m., eh@eduardhiebert.com wrote:
Can you or do you know of who has the hardware/know-how to read a miniature SD HC card used in CPAP machines?
Overall its but a tiny miniature approximation of the 3.5" square HD floppies measuring approximately 122x132mm (7/8 x 1.25 inches).
In the further detail the ResMed brand micro diskette labelled SD HC has a rectangular plastic disk frame. The insert end has one corner notched off with a hyper small rectangular notch on the same long side edge similar to the old 7" floppies. On the opposite long side it has a small slider to lock or unlock
Unlike the 3.5" floppies which have a slider that exposes the floppy, this one has 9 gold plated tabs at the notched end where 7 have a plastic insert divider and the 8th immediately below the notched off corner has two tabs for a total of 9 tab sections.