| DISKCOMP |
|
| Compares the contents of two floppy disks. |
|
| This command performs a track-by-track comparison. DISKCOMP determines the |
| number of sides and sectors per track to compare based on the format of the |
| first disk you specify. |
|
| Syntax |
|
| DISKCOMP [drive1: [drive2:]] [/1] [/8] |
|
| Parameters |
|
| drive1: |
| Specifies the drive containing one of the floppy disks. |
|
| drive2: |
| Specifies the drive containing the other floppy disk. |
|
| Switches |
|
| /1 |
| Compares only the first sides of the disks, even if the disks are |
| double-sided and the drives can read double-sided disks. |
|
| /8 |
| Compares only the first 8 sectors per track, even if the disks contain 9 |
| or 15 sectors per track. |
|
| Related Command |
|
| For information about comparing two files, see the FC command. |
|
|
| DISKCOMP--Notes |
|
| Invalid drive for DISKCOMP |
|
| The DISKCOMP command works only with floppy disks. You cannot use DISKCOMP |
| with a hard disk. If you specify a hard disk drive for drive1 or drive2, |
| DISKCOMP displays the following error message: |
|
| Invalid drive specification |
| Specified drive does not exist |
| or is non-removable |
|
| DISKCOMP messages |
|
| If all tracks on the two disks being compared are the same, DISKCOMP |
| displays the following message: |
|
| Compare OK |
|
| If the tracks are not the same, DISKCOMP displays a message similar to the |
| following: |
|
| Compare error on |
| side 1, track 2 |
|
| When DISKCOMP completes the comparison, it displays the following message: |
|
| Compare another diskette (Y/N)? |
|
| If you press Y, DISKCOMP prompts you to insert disks for the next |
| comparison. If you press N, DISKCOMP stops the comparison. |
|
| DISKCOMP ignores a disk's volume number when it makes the comparison. |
|
| Omitting drive parameters |
|
| If you omit the drive2 parameter, DISKCOMP uses the current drive for |
| drive2. If you omit both drive parameters, DISKCOMP uses the current drive |
| for both. If the current drive is the same as drive1, DISKCOMP prompts you |
| to swap disks as necessary. |
|
| Using one drive for the comparison |
|
| If you specify the same floppy disk drive for drive1 and drive2, DISKCOMP |
| does a comparison by using one drive and prompts you to insert the disks as |
| necessary. You might have to swap the disks more than once, depending on the |
| capacity of the disks and the amount of available memory. |
|
| Comparing different types of disks |
|
| DISKCOMP cannot compare a single-sided disk with a double-sided disk or a |
| high-density disk with a double-density disk. If the disk in drive1 is not |
| of the same type as the disk in drive2, DISKCOMP displays the following |
| message: |
|
| Drive types or diskette types not compatible |
|
| Using DISKCOMP with networks and redirected drives |
|
| DISKCOMP does not work on a network drive or on a drive created or affected |
| by a SUBST command. If you attempt to use DISKCOMP with a network drive or a |
| drive created by the SUBST command, DISKCOMP displays an error message. |
|
| Comparing an original disk with a copy |
|
| When you use DISKCOMP with a disk that you made with the COPY command, |
| DISKCOMP may display a message similar to the following: |
|
| Compare error on |
| side 0, track 0 |
|
| This type of error can occur even if the files on the disks are identical. |
| Although the COPY command duplicates information, it doesn't necessarily |
| place it in the same location on the destination disk. For more information |
| about comparing individual files on two disks, see the FC command. |
|
| DISKCOMP exit codes |
|
| The following list shows each exit code and gives a brief description of its |
| meaning: |
|
| 0 |
| The disks are the same. |
|
| 1 |
| Differences were found. |
|
| 2 |
| The user pressed CTRL+C to stop the process. |
|
| 3 |
| A critical error occurred. |
|
| 4 |
| An initialization error occurred. |
|
| You can use the ERRORLEVEL parameter on the IF command line in a batch |
| program to process exit codes returned by DISKCOMP. For an example of a |
| batch program that processes exit codes, see the CHOICE command. |
|
|
| DISKCOMP--Example |
|
| If your system has only one floppy disk drive, drive A, and you want to |
| compare two disks, type the following command: |
|
| diskcomp a: a: |
|
| DISKCOMP prompts you to insert each disk, as required. |
|
|
