[cctalk] Re: Formatting and using RQDX3's and 2190's.

Wow, this is interesting Dave. Took one of the "formatted badly" disks and did a write of your file. root@beaglebone:~/mfm# ./mfm_write --emulation RD54_A -d3 -c1224 -h15 -s 17 Board revision C detected Then a read of the disk: root@beaglebone:~/mfm# ./mfm_read --analyze -e rd.dsk Board revision C detected Found drive at select 3 Returning to track 0 Drive RPM 3596.5 Matches count 34 for controller DEC_RQDX3 Header CRC: Polynomial 0x1021 length 16 initial value 0xffff Sector length 512 Data CRC: Polynomial 0x1021 length 16 initial value 0xffff Interleave mismatch previous entry 0, 10 was 2 now 0 Number of heads 15 number of sectors 17 first sector 0 Unable to determine interleave. Interleave value is not required Drive supports buffered seeks (ST412) Found cylinder 200 expected 1224 Disk has recalibrated to track 0 Stopping end of disk search due to recalibration Number of cylinders 1224, 159.8 MB Command line to read disk: --format DEC_RQDX3 --sectors 17,0 --heads 15 --cylinders 1224 --header_crc 0xffff,0x1021,16,0 --data_crc 0xffff,0x1021,16,0 --sector_length 512 --retries 50,4 --drive 3 Retries failed cyl 0 head 0 Bad sectors on cylinder 0 head 0: 0 1 2 Retries failed cyl 0 head 3 Bad sectors on cylinder 0 head 3: 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 4 Bad sectors on cylinder 0 head 4: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 5 Bad sectors on cylinder 0 head 5: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 6 Bad sectors on cylinder 0 head 6: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 7 Bad sectors on cylinder 0 head 7: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 8 Bad sectors on cylinder 0 head 8: 0 1 2 3 4 5 6 7 8 9 10 11 12H 13 14 15 16 Retries failed cyl 0 head 9 Bad sectors on cylinder 0 head 9: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 10 Bad sectors on cylinder 0 head 10: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 11 Bad sectors on cylinder 0 head 11: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 12 Bad sectors on cylinder 0 head 12: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Retries failed cyl 0 head 13 Bad sectors on cylinder 0 head 13: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 So looks like the disk is either not taking the format or something is very very wrong. Wonder what happened to all these disks.... C