I am only going to use it as backup. I bought the cheapest Seagate. Name of the drive is “Seagate Barracuda 4TB”. I started a backup and it was faster than expected. After a few hours when i checked if the backup was finished it had stopped with an error. The error message said that the drive had been removed. It was still visible in explorer. In the system log i could see that the drive had been removed. Strange because it was now connected. I restarted the backup and a few hours later the backup had stopped because the drive was removed. The backup had stopped nearly at the same place as before. That looked suspicious. I started too google about this Seagate drive. It is a SMR drive with an CMR cache. My guess is that the drive ran out of CMR cache after 400GB and got so slow that the SAS card thought it had been removed or failed. I connected it through USB2 instead. The the backup would finish OK but it was much slower. I will keep this drive but i will never buy a SMR drive again.
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