Hi

I know this topic has been discussed a ton over the years since some successfully replaced the SSHDD drive in the Shield TV Pro. But I have a question.

My Shield TV Pro is an original 2015 version with the 500GB hard drive. Lately, it has been slow to boot and sometimes freezes completely. I'm ready to undertake replacing the internal drive with a Samsung 860 EVO 2.5" SATA III 500GB Internal SSD (MZ-76E500B) ( https://www.amazon.ca/Samsung-SATA-500GB-Internal-MZ-76E500B/dp/B07HSYJ4JJ/ref=sr_1_6?dchild=1&keywords=Samsung+500GB+EVO&qid=1610552476&sr=8-6 )

My only available computers are 2 Mac's. One running Catalina and the other High Sierra. I sure can reboot into a Linux live CD but I'm wondering if I could just clone the drive right from the command line. I'd like to get a USB Dual Hard Drive Dock like this one: https://www.amazon.ca/Dual-Bay-External-Duplicator-Tool-free-Supported-Update/dp/B073QLNV5Z/ref=sr_1_6?dchild=1&keywords=USB+Hard+Drive+Dock&qid=1610589202&sr=8-6

I can't clone to the Mac and then clone back onto the new SSD, both Mac's only have 256 GB internal drives :(

So here are my planned steps:

1. I'm not going to unlock the bootloader or factory reset beforehand
2. Remove the drive from Shield TV following this: https://www.youtube.com/watch?v=BlodnUU4Cl8&t=1s
3. Place drive into the Dual Dock along with the new Samsung EVO Drive
4. Copy using DD from the Mac Terminal
5. Exact Command: "dd if=/dev/sda of=/dev/sdb" (Of course I will fdisk -l to make sure sda and sdb are the correct drives.) (P.S. according to the man page this command is supposed to do a byte-to-byte exact copy of the drive. Bet it's going to take a long time for 500GB)
6. Pop the new Samsung EVO back into the Shield TV
7. Boot and test everything
8. Profit!

Can you see any problems or potential errors that I might come across?

I've seen tons of guides using Windows computers or Linux live environments but not one with a Mac.