Just bought a new Elements 4Tb and when I try to erase/format the drive using Disk Utility the erase fails with “mediakit reports not enough space on device for requested operation” I have an older WD 4Tb drive which works fine on my iMac. I eventually managed to erase/format the new drive using disk utility on an old iBook G4 running OS X 10.4.11.
I then tried to erase and reformat the disk once again on my iMac and the same error occurred. Why can’t I erase/format the disk using Disk Utility in El Capitan?
I have now started Time Machine on my iMac using the new drive formatted on the iBook and will wait and see if that is successful.
If not the new elements drive will be returned for refund to Currys/PC World.