Very good map. To give an idea of writing time: * Micro-SD being in my player Sandisk Sansa + I copied over 4GB of music from my computer in 20 minutes * Micro-SD being in the supplied adapter, and everything in my card reader 58 in 1, I copied the same 4GB 10 min. It seems to me correct. I have no personal evaluation of reading time. Amazon: impeccable service. But why do I not bill?