Commodore 128 System Manual page 270

This command stores (SAVEs) a BASIC program on disk. (See
SAVE to store programs on tape.) A filename up to 16 characters
long must be supplied. The default device number is 8, while the
default drive number is 0.
EXAMPLES:
DSAVE"BANKRECS"
SAVEs the program " BANKRECS" to disk.
DSAVE (A$)
SAVEs the disk program named in the variable A$.
DSAVE "PROG 3",D1,U9
SAVEs the program " PROG 3" to disk on unit number 9, drive 1.
(On a dual drive unit).
DVERIFY
Verify the program in memory against the one on disk
DVERIFY "filename"[,Ddrive number] [CON | ,>Udevice
number]
This command causes the Commodore 128 to check the
program on the specified drive against the program in memory.
The default drive number is 0 and the default device number is 8.
NOTE:
If a graphic area is allocated or deallocated after a SAVE,
an error occurs. Technically this is correct. Because BASIC text
is moved from its original (SAVEd) location when a bit mapped
graphics area is allocated or deallocated, the original location
where the C128 verified the SAVEd program changes. Hence,
VERIFY, which performs byte-to-byte comparisons, fails, even
though the program is valid.
Binary
To verify
VERIFY command description.
EXAMPLES:
17-28
data, see VERIFY " filename" ,8,1 format, under