According to the seller, this promotional item was oversold, hence offered to replace it with the Adata HC660 which is an ultra-slim model with metal casing. At just 9.6mm in thickness and weighing only 124gm it is an extremely portable external hard disk, but due to its highly compact form it may not be as shock resistant as the thicker HV620S. I was a quite disappointed that the seller did not use any bubble-wrap for safe packing (as hard disks are highly fragile items) despite me having earlier requested them to do so. Fortunately, no visible damage was sustained during the shipment.
Its not being tested yet but its look very sleek. Thanks for fast delivery
Adata 1TB HV620S External Hardisk Black (Slim)