If somthing is wrong, dump the kernel log and rename it to '3.log'.

Check whether your SDHC card can be recognized properly. Specifically, please try the following steps:Ģ) Insert the SDSC card and check whether the card is recognized and whether the system crashes.ģ) If the card can be recognized, try to read a file from the card and see if the file is corrupted or not.Ĥ) Remove the SDSC card and insert your SDHC card. Please try the 0.9.1 (v2) kext and see if your SDSC card can be recognized. So the driver failed to initialize your SDSC card due to mismatched card clock. However, when you removed the SDHC card and inserted the SDSC one, the bus was still operating at 208MHz (another bug), That's why you got a read speed of about 75MB/s. Your SDHC card supports the UHS-I SDR104 mode, so the bus clock was switched to 208MHz. System crashes abruptly and laptop resets after a few short minutes after unreadable cards are inserted or a few longer minutes after my readable SDHC card was inserted.Īccording to your kernel log, it seems that you tried the SDHC card before the other two SDSC cards. Only the more recent 16GB SanDisk microSD HC card could be mounted RW. The older 2GB SanDisk microSD (SC?) cards could not be mounted/read Not all cards are not readable I've tried 3 x cards: 2 x older 2GB SanDisk microSD (SC?) and 1 x recent 16GB SanDisk microSD HC that are all RW-able with cholonam's sinetek-rtsx driver. Detailed information can be found in the Github repo ( ). Please give a try and report any issues, as I don't have these chips thus cannot test them.įeel free to report any issues. You need to install the companion Lilu plugin `RealtekCardReaderFriend` which is available at.

Use the `dd` command to get a precise estimate on the I/O speed under macOS.Īs a bonus, your card reader will be recognized as a native one and is listed under Card Reader in System Information. Note that your card may support even higher speed but your card reader may be limited by the OEM.Īlways test your card under Windows or Linux to get an estimate on the threshold. I tested my RTS525A with a SDXC card and got about 75MB/s read speed and 60MB/s write speed. This driver supports SDSC/HC/XC cards and UHS-I SDR12/25/50/104 and DDR50 modes. This driver is based on the Linux driver module `rtsx_pci/usb` which is contributed by engineers from Realtek and therefore is more mature than the FreeBSD/OpenBSD driver.īut I wrote this driver from scratch instead of blindly copying the code from Linux to macOS, so there is no compatibility layer (and performance degradation introduced by the compatibility layer) at all. Please use this thread for general discussion and test reports.

I made a new driver for Realtek card readers, and I would like to invite people to join the beta testing.

Usb card reader driver for mac