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Requirements:

  • Works properly with Linux 4.9 kernel
  • Easy to insert/remove card
  • SDXC card support (64-128GB cards)
  • SDHC card support

Nice to have features:

  • USB 3.0 interface/speed
  • Separate slot for SD and microSD cards (no need for an adapter)

I have tried a few SD card readers but none of them worked properly with older Linux kernels/distributions. Usually they recognized the reader and the memory card but there were unreadable files and IO errors. As far as I remember they worked well with Windows so I guess it was a driver bug in Linux.

1

Kingston Digital USB 3.0 Super Speed Multi-Card Reader for SD/SDHC/SDXC/microSD/MS/Compact Flash CF Cards (FCR-HS4)

Manufacturer page: https://www.kingston.com/US/flash/readers/FCR-HS4
Amazon page: https://www.amazon.com/gp/product/B00VAGX6MW

Meets all your requirements and I have used it successfully with Linux Kernels beginning with 4.4, 4.8, 4.10, and several newer kernels.

It is fast and reliable with all cards I have used up to 256GB.

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0

Kingston FCR-MLG4 MobileLite G4 works well for me.

Works properly with Linux 4.9 kernel

Works well with Debian Stretch (Linux kernel 4.9) and Ubuntu 17.10 (kernel 4.16).

Easy to insert/remove card

It fairly easy. (I found that easier than both Kingston FCR-MRG2 Generation 2 micro SD Reader and Kingston FCR-ML MobileLite 9-in-1 Card Reader).

SDXC card support (64-128GB cards) SDHC card support

Works well with a variety of SD cards. I have tested it with sizes between 2GB-64GB without any issue.

USB 3.0 interface/speed

Yes, it supports USB 3.

Separate slot for SD and microSD cards (no need for an adapter)

It has separate SD and microSD size slots. Additionally, both work at the same time.

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