Thanks for the info!

>Terry,
>
>LEN(xx) will tell you the size of compressed string. To find the size it'll require on the floppy, you'll have to round it up to the nearest 512 bytes (the sector size on the floppy).
>
>>Hi Sergey,
>> I am working with a file compression routine that will be
>>used to compress each file in a backup folder,
>>xx = compressit(FILETOSTR("C:\BACKUP\INPUT.BMP")),
>>and then copy the compressed file from a MVAR to a file on a floppy disk,
>>STRTOFILE(xx, "A:\OUTPUT.BMP"). I want to know if the floppy disk
>>will hold the next file. If not, I will prompt for a new floppy.