hdds Internal HDD meant for Additional Storage/Steam Library Extremely SLOW
The drive has a maximum sustained speed of 220 MB/s as can be seen in the datasheet for the 2 TB model.
The drive is most likely using SMR to write data to it, but write speeds shouldn't be affected to the point where you get that high drive usage and speeds dropping to 0.
Get some diagnostic software and check the SMART information ... the drive may have some defects and have a hard time writing the data to the platters in which case best to return the drive to warranty.
If you want CMR drives, the WD Red Plus is guaranteed to be CMR... anything else at low capacities is SMR. Usually drives with big cache (more than 128 MB) are SMR, as CMR drives don't really benefit from more than 128 MB of cache.
PS. It's very rare but not impossible to have a bad SATA cable or dirty SATA connector causing transmission errors, making the drive slow down. Try and see if it's the same with another SATA cable, plugged in another SATA port on your motherboard.
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