24 hours for 70 gigs!?.. that certainly is an issue/problem/concern.
Even with a slow USB 2.0 drive something like that should take about an hour and a half.
I wonder if you just drag (copy) a file onto the drive if it still has such a slow transfer rate.
Is it that slow on any computer or just your at home Mac?
Maybe you should call the nice man at the Apple store and run this issue by him.
Generally speaking though the new WD drives are problematic. I’ve used them for years and recently made the switch to Seagate drives due to the problems with the new WD stuff.
The easiest way out of this hassle is to return the drive (like I did).
You can reformat practically any hard drive for Mac OS in like three minutes, so you really don’t need to go to an Apple store. Other computer stores have a much larger variety of drives…all of which can be formatted and used with any of your Macs in minutes.
If you need instructions on how to format a drive for Mac OS there are thousands of pages online that explain it step by step.
-attach the drive
-launch Disk Utility (in the Utilities folder which is inside the Applications folder)
-Select the drive from the left column.
-select erase and choose the new format to be Mac OS journaled
-name your new drive and click erase.
In a minute or two it’ll be done.