Maximum file size on SD card reader?  

Re: Maximum file size on SD card reader?

A bit of confusion here on card size (Gb) and file size (Mb).

If you save your 44Mb file to a 32 Gb FAT32 formatted SD, then Prusa can read and print it. What it can't read is any file size at all with the SD card formatted as XFAT or NTFS.

This link may help you use the whole card, but it may be easier and safer to just get and use smaller card(s).

https://answers.microsoft.com/en-us/windows/forum/windows_10-files/format-a-sandisk-extreme-64gb-micro-sd-card-to/ff51be64-75b9-435f-9d39-92299b9d006e

Re: Maximum file size on SD card reader?

are you sure your gcode fits on such a small card?

Re: Maximum file size on SD card reader?

A bit of confusion here on card size (Gb) and file size (Mb).

If you save your 44Mb file to a 32 Gb FAT32 formatted SD, then Prusa can read and print it. What it can't read is any file size at all with the SD card formatted as XFAT or NTFS.

Bill, you just confused me 🙁 I always understood that lower case "b" stood for "bit" and upper case "B" is "Byte" 😉

Peter

Re: Maximum file size on SD card reader?

Gb = gigabit. GB = gigabyte. etc.

Re: Maximum file size on SD card reader?https://shop.prusa3d.com/forum/download/file.php?id=24194

Hello All. Thanks for the replies. I apologize for how I typed the file size/card size. Mm Bb. I know better. The reply from Bill is spot on. It was the formatting of the card that was the issue. It is formatted as exFAT. I'll change that.

-Keith

Re: Maximum file size on SD card reader?

OK, Looks like this SDXC card cannot be formatted as FAT32 as that option is not available. Ill just put it back in my phone.
When the printer did not read the file I first thought "file size" problem. Thanks Bill, as it is "Format style".

Re: Maximum file size on SD card reader?

OK, Looks like this SDXC card cannot be formatted as FAT32 as that option is not available. Ill just put it back in my phone.
When the printer did not read the file I first thought "file size" problem. Thanks Bill, as it is "Format style".

I've been using this for some time to format SDXC cards to FAT32. Works every time.

http://www.ridgecrop.demon.co.uk/index.htm?guiformat.htm

Re: Maximum file size on SD card reader?

Thanks Richard. I'll give it a shot.

Re: Maximum file size on SD card reader?

OK, Looks like this SDXC card cannot be formatted as FAT32 as that option is not available. Ill just put it back in my phone.
When the printer did not read the file I first thought "file size" problem. Thanks Bill, as it is "Format style".

I've been using this for some time to format SDXC cards to FAT32. Works every time.

http://www.ridgecrop.demon.co.uk/index.htm?guiformat.htm

Yeah, Microsoft doesn't think you should be formatting these cards with anything but the default formatting as defined by the SD specification, therefore they don't provide the tools. Technically it does work, so that is why you have to go to 3rd party tools in Windows to do this. See this link from SanDisk about which type of cards have which range of sizes, and what their default formats are: https://kb.sandisk.com/app/answers/detail/a_id/2520/~/sd%2Fsdhc%2Fsdxc-specifications-and-compatibility

(Note, small microcontroller based projects, like the Einsy boards at the heart of our i3 printers, can only read FAT16, and FAT32 (maybe FAT and FAT12, I haven't tried those). I should probably dive into the source at some point to see how it handles the extended filenames of FAT32. I didn't realize that any of the Arduino FAT libraries could...)

Re: Maximum file size on SD card reader?

I thought I read somewhere that 64GB+ cards weren't supported, but I'm not positive on that.

I should probably dive into the source at some point to see how it handles the extended filenames of FAT32. I didn't realize that any of the Arduino FAT libraries could...)

Seems to handle them just fine. I haven't tried unicode characters, but as I'm a pedantic Linux user my gcode names are usually at least 20 characters (e.g. "black lion neck rear_0.4x0.1mm_MK3_PLA.gcode"). The MK3 reads them fine and just scrolls the name on the display when I pause on it in the list.

Re: Maximum file size on SD card reader?

I thought I read somewhere that 64GB+ cards weren't supported, but I'm not positive on that.

Probably because 64GB+ cards (which are SDXC because SDHC maxes out at 32GB) are by default formatted with exFAT. If you are able to reformat them with FAT32 they should work. Please read the SanDisk link I pointed to so you can see the ranges of the different SD card styles, and the default formatting for each style. (FAT32 should be good up to 2TB.)

I should probably dive into the source at some point to see how it handles the extended filenames of FAT32. I didn't realize that any of the Arduino FAT libraries could...)

Seems to handle them just fine. I haven't tried unicode characters, but as I'm a pedantic Linux user my gcode names are usually at least 20 characters (e.g. "black lion neck rear_0.4x0.1mm_MK3_PLA.gcode"). The MK3 reads them fine and just scrolls the name on the display when I pause on it in the list.

Yes, my point was the MK3 that I have (presumably also the earlier versions) handle extended filenames fine. The Prusa firmware is compilable by Arduino, like my Arduino UNOs and AdaFruit Feathers. Last time I worked with Arduino data logging to an SD card I was limited to 8+3 filenames by the Arduino FAT library that I was using. I tried looking for a FAT library that could handle the extended filenames and was unable to come up with one. Now that I see an Arduino compatible project handling extended filenames I want to see how they do that for my own future use. (Though, I wonder if there are some extra tricks to use as at least in pronterface if I try to get a listing of the files on the SD card I see the 8x3 filenames... I haven't tried sending the gcode instruction to get the file listing yet, and I can't until I return home to my MK3.

But... me thinks I'm drifting away from the thread.

Re: Maximum file size on SD card reader?

Bill, you just confused me 🙁 I always understood that lower case "b" stood for "bit" and upper case "B" is "Byte" 😉

Peter

Yes Peter, you are right - but it is also convention to capitalize the part of an expression that was wrong (for emphasis) - and it was the Mega/Giga that were confused.

Perhaps I should adopt Thingiverse speak and call everything mb - who needs to convey meaning accurately in this world 😈

Re: Maximum file size on SD card reader?

OMG! Thank you Richard! My PC didn't have a SD card slot so I bought a reader and a new card...I guess my eyes were bigger than my stomach. I thought my reader was causing teh issue! Thank you!