Spark 32GB USB 3.0 Flash Drive (PSF32GSPK3USB) is great size, nice design, but impractical chain and disappointing write speed. 

In Ubuntu 12.04 x64 Precise on HP EliteBook 8540w USB 3 enabled, bench-marking software from Disk Utility.

In Windows 7 x64 HP EliteBook 8560w USB 3 enabled, bench-marking software USBDeview from Nirsoft.

$ lsusb -t
1-1.1:1.2: No such file or directory
1-1.1:1.3: No such file or directory
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
    |__ Port 2: Dev 3, If 0, Class=stor., Driver=usb-storage, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M
        |__ Port 4: Dev 3, If 0, Class=HID, Driver=usbhid, 12M
        |__ Port 4: Dev 3, If 1, Class=HID, Driver=usbhid, 12M
        |__ Port 4: Dev 3, If 2, Class=HID, Driver=usbhid, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/3p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
        |__ Port 1: Dev 3, If 0, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M
        |__ Port 1: Dev 3, If 1, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M
        |__ Port 1: Dev 3, If 2, Class=vend., Driver=, 12M
        |__ Port 1: Dev 3, If 3, Class=app., Driver=, 12M
        |__ Port 5: Dev 4, If 0, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M
        |__ Port 5: Dev 4, If 1, Class='bInterfaceClass 0x0e not yet handled', Driver=uvcvideo, 480M

In reality on copying number of large media files on NTFS 64k block size it performs just over 9 MB/s, I am copying from a SSD drive with nothing just copying in active windows.

I am very disappointed, it is second-class performance, some 5 years old USB sticks do better than that, specification on manufacturers website is some theoretical read speed.

USB drive is supplied with a small chain, my advice is to replace it as soon as possible, it is soft and loose.