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Although the product literature claims the 128 GB version works with Mac OSX, this is not correct as regards the capacity meter nor is it true with regards to speed. This meter does not work properly on the Mac for any of the formatting options that I tried (NTFS, MS-DOS(Fat) and exFAt). It also does not work with any of the standard Mac formats. The Lexar web site has numerous FAQs, but none mentions this issue. Thus, if you have a Mac, and the capacity meter is important, you should not buy this drive. The speed of this drive is also affected by the formatting. When any of the standard windows formats are used with Macs, the speed drops to half for both read and write relative to the speeds advertised. This may be due to the Mac having to convert data for the format. But since Macs read the windows formats, but none of my PCs read Mac formats, the windows formats are preferred. The above negative comments do not apply for Windows users. When tested on my PC, the speeds were very close to those advertised. This drive needs a firmware update for use on Macs, and I returned the drive. My hope is they will update this drive in the near future so it actually works with Macs. Update: 20 May 2012 After reading this review, a representative of Lexar contacted me and confirmed that one cannot use this flash drive on a Mac using Mac formatting if one wishes to use the capacity meter. Indeed, the capacity meter will only work if the original formatting is left unchanged from the MS-DOS(Fat) format. Any attempt to change this format will likely confuse the firmware and disable the capacity meter, even if one reformats the drive back to MS-DOS(fat). I ordered a second flash drive to see if I could get this to work with my Mac by not reformatting. I am happy to report that the meter works, but because I am using the original MS-DOS(fat) format, the write and read speeds are roughly half of those reported. This slowdown is due at least in part to the Mac having to do conversions when reading and writing data, I think. I have decided to live with the slower speed so I have the capacity meter working. What ticks me off is that there is absolutely no discussion of this issue on the web site or in the included documentation. Until the web site is updated with the information that is above, I will keep the rating for this device at 2. Users deserve not only good hardware, but honest and complete documentation.