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Storage

Setup and In-Use

Setup is nearly identical to setting up the Pogoplug Mobile, so I'll just highlight some differences. The USM connectivity appears to be Plug and Play (although I tend to think of it more as Plug and Pray) and can be used with any 2.5" SATA drive, although you won't get as secure a fit for a bare drive.

USB 3.0 also functions as advertised, with both USB 2.0 and USB 3.0 drives showing up when connected via the USB 3.0 ports. I also tried plugging in my test Seagate GoFlex USB 3.0 drive into the USB 2.0 connection, and it worked properly as well.

Using the Pogoplug Series 4 is identical to using the Pogoplug Mobile, so I'll refer you over to that review. In short, the Series 4 worked well when sharing files, plugging and unplugging drives, and connecting to the 'Net. Pogoplug still has some kinks to work out with streaming video, although at this point I would say most of these 'Plug devices really don't have the processing power to handle it. You'd be better off picking out a software solution like Pogoplug's Premium Software to handle transcoding on a computer.

Performance

The real reason anyone would be buying the Series 4 over the Mobile would be for the higher storage throughput. With USB 3.0 and USM, the Series 4 finally has enough theoretical bandwidth to make it an alternative to some of the other low-end NAS products. So does it stand up to the task?

In short, yes and no. The Series 4 is the first Pogoplug since the doomed Video model that has enough performance to make good use of the Gigabit Ethernet connection and to take advantage of the higher bandwidth of the USB 3.0 and USM drive interfaces.

To test the Series 4, I transfered the "My Documents" folder (a few thousand files of various sizes totaling around 370 MB) from my Windows machine, which uses an SSD, to and from the Pogoplug.

Table 1 shows the results with the Seagate GoFlex drive provided by Pogoplug connected to the Series 4 via USB 2.0, USB 3.0 and USM. I left the GoFlex in its default HFS+ format for all the tests.

Connection Type Transfer Speed
(MB/s)
Transfer Time
(seconds)
USB 3.0 Read 23.25 16
USB 3.0 Write 5.3 70
USM Read 23.25 16
USM Write 5.3 70
USB 2.0 Read 18.6 20
USB 2.0 Write 4.3 85
USB 2.0 Direct Connection Read 26.6 14
USB 2.0 Direct Connection Write 20.6 18
Table 1: Folder copy performance - Seagate GoFlex drive

The results show that the USB 3.0 and USM connections yield about 25% more read throughput than a USB 2.0 connected drive, but not much write gain.Write performance seems to be a consistent weakness in Pogoplug designs and the Series 4 seems to continue that tradition. Note that transfers of many smaller files are always harder than single large file copies due to the overhead of drive head seeks and transfer protocol. But that doesn't account for the huge difference in read and write performance.

The USB 2.0 Direct Connection entries represent tests run with the GoFlex connected to my Mac (due to its HFS+ format), which also uses an SSD. Read speed is about 25% better than the Series 4 USB 2.0 result. But you really see the Series 4's write performance hit, since the Mac was able to write at the same speed as read.

To check that the GoFlex drive wasn't limiting performance, I ran the same tests with a Seagate 7200 RPM ST9500420AS 3.5" SATA drive and the USB 2.0 and USB 3.0 dongles supplied in the GoFlex kit. The results were essentially the same, except the direct-connected tests came in at 28 MB/s read and 31 MB/s write.

Overall the numbers speak for themselves. The Pogoplug is still not as fast as a direct-connected disk, or even a single drive NAS using the same CPU like the Seagate Black Armor 110. It does still require installing Pogoplug's "drivers" to connect to the disk as a network share, too.

Conclusion

Overall, the Pogoplug Series 4 is worthy of the money only if you plan to use a USB 3.0 or USM drive and only if you don't mind significantly slower writes than reads. Otherwise it is really no different than the Pogoplug Mobile when it comes to streaming video, music, photos, or anything else.

Unless you have a craving for more (read) speed, or want to "future-proof" yourself, in hopes of Pogoplug one day solving its write speed problem, I would recommend saving the money and sticking with the Pogoplug Mobile.

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