you might also look at patent 4979173 cirrus / adaptec from around that time
x^52 + x^50 + x^43 + x^41 + x^34 + x^30 + x^26 + x^24 + x^8 +1 licensed from Glover On 11/18/16 3:02 PM, David Gesswein wrote: > On Thu, Nov 17, 2016 at 03:33:36PM -0700, Eric Smith wrote: >> I'm not looking forward to trying to reverse-engineer 48-bit and 56-bit ECC >> polynomials. However, they usually tried to choose polynomials with >> relatively few terms, to minimize the number of XOR gates needed in the >> hardware. >> > ... >> There might be some other short-cuts to reducing the search space, but I >> haven't yet given it a lot of thought. >> >> > I haven't run across it yet. If they used it for the header it is easy to > reverse since they naturally have a pattern that is easy to calculate the > polynomial from. You may find sector data with the correct pattern to also > use the method. > > http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html >
