Copying using Clonezilla lasted 1m30 (yes ..) exactly via a tower and direct connections in Sata2.
When booting Win7 to start as if nothing had happened, then a single pass in the management of records for inclusion of additional space. Had anything else to do.
Remains to be seen over time but returns for this disc are very good (one of the few to offer MLC chip for this price range), and with the release of M550 this makes it a perfect drive to boost a computer less cost.