./mfm_read -a -e ndc5525.ex
Board revision B detected
Found drive at select 1
Returning to track 0
Drive RPM 3601.3
Matches count 34 for controller WD_1006
Header CRC: Polynomial 0x1021 length 16 initial value 0xffff
Sector length 512
Data CRC: Polynomial 0x140a0445 length 32 initial value 0xffffffff
Selected head 8 found 0, last good head found 5
Read errors trying to determine sector numbering, results may be in error
Number of heads 6 number of sectors 17 first sector 1
Interleave (not checked): 1 10 2 11 3 12 4 13 5 14 6 15 7 16 8 17 9
Drive supports buffered seeks (ST412)
No sectors readable from cylinder 820                                          
Disk has recalibrated to track 0
Stopping end of disk search due to recalibration
Number of cylinders 820, 42.8 MB

Command line to read disk:
--format WD_1006 --sectors 17,1 --heads 6 --cylinders 820 --header_crc 0xffff,0x1021,16,0 --data_crc  0xffffffff,0x140a0445,32,6 --sector_length 512 --retries 50,4 --drive 1 
ECC Corrections on cylinder 622 head 1: 5(2)                                   
Found cyl 0 to 819, head 0 to 5, sector 1 to 17                                
Expected 83640 sectors got 83640 good sectors, 0 bad header, 0 bad data
0 sectors marked bad or spare
1 sectors corrected with ECC. Max bits in burst corrected 2
Track read time in ms min 25.084458 max 958.621625 avg 34.011784