We don’t know the cache capacity, but what we can observe is that it generally performs worse compared to the G-Tech 2TB mobile USB-C drive, which is likely to contain a 2TB single platter version of this drive. What we know is that this hard disk drive has 5,400RPM platters, probably two of them, each with a 2TB capacity, hence the increased thickness. You can buy it (WD40NMZM) from eBay, but it will cost four times the price of the WD My Passport Ultra 4TB portable drive – the laws of supply and demand at work! This storage solution uses an OEM drive that’s not available on the open market – WD’s laptop drives have a maximum capacity of 2TB. Here’s how the WD My Passport Ultra 4TB performed in our benchmark tests:ĬrystalDiskMark: 127MBps (read) 124MBps (write)Ītto: 130MBps (read, 256mb) 122MBps (write, 256mb)ĪS SSD: 122MBps (seq read) 113MBps (seq write) Performance
