I did not partition it.
Although you can create a filesystem without a partition, it's not recommended.
Yes, I bought it used...
You should start by testing the SD card it self. Write 100 GB, and see if you can read it back.
A simple test:
#!/bin/bash
mkdir ~/disktestbyLoyce
cd ~/disktestbyLoyce
wget http://ipv4.download.thinkbroadband.com/1GB.zip
i=1; while test $i -le 100
do cp 1GB.zip 1GB.zip$i
i=$((i+1))
done
md5sum 1GB.zip*
rm 1GB.zip*
cd; rmdir ~/disktestbyLoyce
If your SD card is okay, it will show the same checksum 101 times without errors.
SD with 200 GB available... used from ebay... From shop, it would cost about $200, you can buy a decent USB HDD from this price and it would not have only 256 GB space but much more.
Anyway, how much space is needed to host a full node? I'm thinking about the same, using a Raspberry PI to run a full bitcoin node and I'm thinking about what size of USB HDD I need to buy.
Does SD card is a possible solution for storage, when running a node on PI? I mean the OS is writing on the swap partition continously, so SD can reach it's write limit in no time and after you can just trash your SD?