Read this one
Drive was pruchased from a market on the Russian-Chinese border, when he went back to complain, the stall was gone. Woooo, spooky. I wonder if there was a puff of smoke just as he turned his back.
The article also says that the firmware was altered to report that it was 500GB, and as files were added it calculated their sizes and deducted them from the available total so it looked like the whole file was transferred but only held 128MB at a time and then started writing over the start of the drive when it was full.