Optical disc verification method and optical disc medium

An optical disc verification method comprising the steps of:

• writing data on first, second and third radial locations on an optical disc at a writing speed V1 and reading the data written there, thereby measuring read signal quality index values A, B and C, where the second radial location is inside of the first radial location and the third radial location is inside of the second radial location;
• writing data on the first and second radial locations at a writing speed V2, which is higher than V1, and reading the data written there, thereby measuring read signal quality index values D and E;
• correcting the signal quality index value C with the difference between the signal quality index values B and E, thereby calculating a signal quality index value F that would be obtained if data is written on, and then read from, the third radial location at the speed V2 and;
• writing data on the first radial location at a writing speed V3, which is even higher than V2, and reading the data written there, thereby getting a read signal quality index value G;
• and
• correcting the signal quality index value E with the difference between the signal quality index values G and D, thereby calculating a signal quality index value H that would be obtained if data is written on, and then read from, the second radial location at the speed V3.