After testing 7gb

The media is likely to be defective.
1012.4 MByte OK (2073586 sectors)
5.8 GByte DATA LOST (12297230 sectors)
Details:7 KByte overwritten (14 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
5.8 GByte corrupted (12297216 sectors)
7 KByte aliased memory (14 sectors)
First error at offset: 0x000000003f47e400
Expected: 0x000000003f47e400
Found: 0x000000003f4fe000
H2testw version 1.3