./mfm_read -a -e tek.dat -m tek.em -t tek.tr
Board revision B detected
Found drive at select 1
Returning to track 0
Drive RPM 3601.7
Found matching format Intel_iSBC_214_512B:
Selected head 8 found 0, last good head found 7
Read errors trying to determine sector numbering, results may be in error
Number of heads 8 number of sectors 17 first sector 0
Interleave (not checked): 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Drive supports buffered seeks (ST412)
No sectors readable from cylinder 917                                          
Stopping end of disk search due to two unreadable tracks in a row
Number of cylinders 917, 63.9 MB

Command line to read disk:
--format Intel_iSBC_214_512B --sectors 17,0 --heads 8 --cylinders 917 --header_crc 0xffff,0x1021,16,0 --data_crc  0xffffffff,0x140a0445,32,5 --sector_length 512 --retries 50,4 --drive 1 
ECC Corrections on cylinder 12 head 7: 14(2)                                   
Bad block set on cyl 49, head 1, sector 16                                     
Bad block set on cyl 60, head 1, sector 16                                     
Bad block set on cyl 63, head 4, sector 16
Bad block set on cyl 104, head 5, sector 16                                    
Bad block set on cyl 107, head 3, sector 16                                    
Bad block set on cyl 257, head 2, sector 16                                    
Bad block set on cyl 269, head 1, sector 16                                    
Bad block set on cyl 284, head 7, sector 16                                    
Bad block set on cyl 493, head 7, sector 16                                    
Bad block set on cyl 554, head 5, sector 16                                    
Bad block set on cyl 555, head 5, sector 16                                    
Bad block set on cyl 729, head 1, sector 16                                    
Bad block set on cyl 740, head 1, sector 16                                    
Bad block set on cyl 786, head 1, sector 16                                    
Found cyl 0 to 916, head 0 to 7, sector 0 to 16                                
Expected 124712 sectors got 124698 good sectors, 0 bad header, 0 bad data
14 sectors marked bad or spare
1 sectors corrected with ECC. Max bits in burst corrected 2
Track read time in ms min 28.682250 max 2921.048375 avg 41.793320