Over the previous year or two, in a misguided attempt to be fully Windoze8 compatible, SanDisk had begun configuring their USB memory drives as "fixed" rather than "removable". (They stopped doing that in 2014.) Well, there are some specialized apps, that partition the thumb drive with use as a bootable operating system, that choke on this difference... (if you just want to plug this device into your Mac or Windoze or linux box to store/move files, as most people do, it'll work fine.)
Since this "fixed disk" configuration is a problem for my intended use of this device, I contacted SanDisk to see if they could exchange it for me. They indicated a willingness to do so, but said I'd have to wait at least a week until they had the product on hand. (If that doesn't work out within a few weeks, I'll contact a4c about a return...)
So, be forewarned: even though this thumb drive's packaging has no Win8 logo on it, the drive's "removable" bit was NOT set by the manufacturer, and so it shows up as a "fixed" (non-removable) drive.
This drive comes pre-loaded with a windoze executable, but, unlike the 8GB Facets, it is not configured to auto-run, so you could safely ignore and remove the SanDisk software from a windoze box if you did not want unknown software to ever run on your computer.
I like this form factor (good compact size, shape, no cap to lose or waste space, plus it's not bad eye candy) so much ... even though it has no activity indicator and it is not particularly speedy.