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Minix/1.7.5/MANUALS/CAT0/DISKCHEC

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+Command:   diskcheck - check a disk for bad sectors
+Syntax:    diskcheck device start count
+Flags:     (none)
+Examples:  diskcheck /dev/at0 0 1200 # Check 1.2 MB diskette
+           diskcheck /dev/at0 100 50 # Check blocks 100 to 149
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+     Diskcheck checks a disk for bad sectors by reading in each  sector,
+writing  a  known  bit pattern onto it, reading it back in and comparing
+with what was written.  This check is then  done  a  second  time.   Bad
+sectors  are reported.  After each sector is tested, the original sector
+is restored.  Only use this program on unmounted partitions.  Killing it
+part way through may result in lost data.
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+                                                                        
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