Then I copied the big folder. Several times. The time was between 17:49 and 20:35, or between 37.7MB/s and 43.5MB/s. The Windows copy dialog was instructive. Here are three screen shots of what was going on:
At times the copy was going fast – typically almost 300MB/s – and at other times slowly – usually around 19MB/s, sometimes as low as 5MB/s.
Was there something wrong with the Windows computer (and the Mac)? So I repeated with two other drives. One was an old 128GB SSD that used to be my desktop C: drive some years ago, which I’d popped into a USB 3.0 casing. The other was a fairly recent LaCie USB Type-C 1TB hard drive. Both ran much slower than the peak speed of the Silicon Power PC60, but were consistent throughout the copy for much snappier performance. The computer copied the large folder to the SSD in 4:42 and to the LaCie in 6:06.66 (ooh, spooky!). That is, they ran at 165MB/s and 127MB/s. Here are screenshots of the Windows copy dialogs for them:
Check, check and quadruple check
I spent a lot of time copying files and folders back and forth, trying to get a sense of what was going on. Copying from the PC60 to a computer was super fast. Copying large collections of data to it usually resulted in a pulsing pattern – although with a different arrangement of the pulses each time, as you can see from the screen shots above. Most of the time the single 3.72GB file copy was consistently fast, but one time, less than halfway through the copy, it went from fast to slow, and remained there for the rest of the copy:
In that case, instead of the usual 14+ seconds, the copy took 2 minutes and 22 seconds! That’s around 27MB/s.
I guess I should mention the other folder copy, the one with the 1,880 files. The time taken was 39.15 seconds to copy from the Windows computer to the Silicon Power PC60, for 43.3MB/s (copying to the LaCie drive was almost identical). All that file opening and closing takes time. Copying it back to the Windows computer from the Silicon Power PC60 took 26.2 seconds (64.6MB/s), which was slower than the 18.76 seconds it took to copy it from the hard drive (90.3MB/s). Here are the write characteristics:
Gadgetguy’s Take – Great capacity, good price, variable speed
The Silicon Power PC60 packs a lot of capacity into a slim case that is very easily pocketable. The weird pulsing of write speed – somewhat reminiscent of what you see with a lot of USB memory sticks – was disconcerting. I would not recommend that you use this SSD to transfer large collections of large files. You won’t know whether the copy will take a modest time, or twenty times that modest time. But for carrying large quantities of music or other data with you, the Silicon Power PC60 SSD is brilliant.