The HP Portable SSD P600's strongest feature is also it's biggest weakness. The drive itself is thin but when you add the undertray the thickness more than doubles. While it's possible to walk around with this drive in your pants pocket, it's more of a backpack, purse, or attaché portable SSD. You could use it like countless other portable SSDs, just the drive without the undertray and the cable loose in your pocket and not have to mess with the excess bulk. It's really more personal preference.
Performance wise, the 1TB P600 we tested is quick enough to satisfy nearly everyone. We didn't see any performance issues in our testing. The drive ripped through our real-world workloads that are very common for what people transfer to and from these devices. It would be difficult to get better performance out of a portable SSD using a SATA interface. There are models like the P800 using Thunderbolt 3, but the interface is far less common than USB.
Over the coming months, we should see more portable SSDs using NVMe internals bridged to USB, but they also have some compatibility issues with motherboards and devices that can't deliver enough power for them to operate correctly.
We feel HP priced the P600 well with prices starting at just $84.99 for the 250GB model. As you scale up the capacity range, the cost per gigabyte decreases. The 500GB at $135.99 is a strong buy, but the 1TB model at $219.99 is the best overall deal if you are willing to invest for it. With 1TB on tap, it's likely you will not run out of space and find yourself deleting files to fit what you need right away on the drive.
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