The SD card needs to be formatted to the primary FAT32 MBR partition type.
Polyend Tracker is offered with a 16 GB microSD card, larger SD cards can also be used as long as they are correctly formatted (The built-in disk-utility under Mac OS will allow you to select FAT32 for formatting).
We recommend UHS-I cards / U3 cards.
If you are on Windows 10/11, formatting bigger cards (32+ GB) to FAT32 can be a bit of a pain.
Here’s a quick guide that will help you achieve this:
exFAT (leave all default settings)fat32format here: Ridgecrop Consultants Ltd
FAT32 (leave all default settings)The question as to why FAT32 is used as the file system for all Polyend Devices, comes up regularly so i figured i’d add some more detail to this:
Most music gear that you currently find on the market, that uses SD cards as a storage solution, use FAT32 as the default file system for several reasons:
It is a highly compatible file system supported by almost all operating systems (Windows, macOS, Linux) and devices.
It is a simple file system with low overhead, which means it is easier to implement in embedded systems (such as music gear) that typically have limited processing power and memory compared to computers.
It supports volumes up to 2TB and individual file sizes up to 4GB. These limits are generally sufficient for most music gear use cases, where typical audio files (such as samples, tracks, or patches) are much smaller than 4GB.
It offers reliable performance for reading and writing small-to-medium-sized files quickly, which is important in music production environments where fast access times are needed (e.g., loading samples).
Due to these reasons, FAT32 remains the default format for SD cards in many music devices despite being older and having limitations compared to more modern file systems.
@Mitch Do you think it could be fine to use a 1T SD card? I think this will be very fast and awesome for the Play+
So 1TB I don’t think you can format to FAT32? I’m not the sd card expert but what really matters is write speed. The black cards we ship with now are much faster than the og play cards. Let me get back to you on speeds but the v90 cards are overkill those are mostly designed for shooting video in 4K. You can use a V30 card and it will get just as good of results. I would not recommend the 10.
Thanks, @Mitch. I am thinking about Scandidk Extreme PRO 256 GB that have a write speed of 140 MB/s. Could be a good option, isn’t it?
what sense in 1TB, if Play support only 256 samples and Tracker 48 per project 
I love my Play+ and have a lot of fun with it. I’m building a LP and the project is very heavy, so it takes a LOT of time to be saved or, in the last times, directly freezed. That’s the reason I am looking for a faster sd card. I really apreciate your time and your fast feedback and all the information you share with us, @Mitch .
Im asking myself the same question when people build a SSD drive into early 90s samplers with under 2 mb ram 