Not disappointed with this 931 GB external hard drive. It is silent, the transfer speed is correct, the use is simple, the USB cable is long enough. It remains to test the reliability of the medium and long term product but for the rest it's all good. More delivery was relatively fast (less than one week). Just a caveat, SD is based FAT 32: do not like me, think to format it to NTFS before you start filling it if you want to store files larger than 2 GB! And there is no On / Off switch!