ECC on MFM drive

Hello, Could someone help me understand the algorithm used for data integrity check on ST251 MFM drive. I have ST251 drive and an Adaptec controller. Also I have ability to view recorded data in raw format. On the track I see ID field block protected by CCITT CRC16. And the data block protected by some 32-bit ECC. This is definitely not a CRC32. The algorithm in general looks like shift register for polynomial multiplication with polynomial equal to x32+x28+x26+x19+x17+x10+x6+x2+1 . But, this is not just a multiplication. The circuit has some other logic that I did not understand yet. I?ve found very useful document (http://www.national.com/an/AN/ AN-413.pdf) It has a mention about algorithm called ?Glover 140A0443 ? May be this is that I have? Please advice. Thank you. Alexander.