Using TSST SH-5202 DVD Multi-recorder connected via USB2 Adapter to Lenovo T520 running clean installed Win10 Pro Needing to make backup copy of language test CD to keep original in useable condition Claims Win10 compatibility but when attempt to make disk-to-disk backup copy. gets to 96% then states 700Mb CD capacity too small and crashes out, ejecting CD but with a 'success' message. Does not write file-list but leaves 42Mb unused. CDBurnerXP utility iteself files show but all zero bytes. Also horrendously slow at 50mins for failed write.