Many of the files posted to Software updates Online are Self Extracting Archive (.sea) files. You will need to double-click on the .sea file to decompress its contents. The result will be a file or folder of files. Many of these .sea files contain Disk Copy version 4.2 images. If you have System Software 7.0.1 or higher, you will need Disk Copy 6.1.3 to work with disk images. If you have System Software 6.0.x or 7.0, you will need Disk Copy 4.2 to work with disk images.

Disk Copy is an application program that creates reliable exact copies of floppy disks from a 3.5-inch master disk or from a disk image file on your hard disk. Disk Copy is used both to create the image files from a master floppy disk, and to create duplicate floppy disks from those image files.

Although there is some similarity between disks duplicated from disk images and disks copied by dragging icons, the results are not identical. Floppy disks created from image files are exact duplicates, including the exact icon placement, appearance of all windows, and the correct name of the disk. In addition, with disk images you have the added assurance that all the files have been duplicated correctly and completely.

Disk Copy runs on any Macintosh computer with one or more 90 mm (3.5-inch double-sided) floppy disk drives.

• Starting the program, after you've downloaded it. To start Disk Copy, double-click the Disk Copy icon. After reading the introductory window, click the window once. The Disk Copy window appears.

1. Choose Single Copy or Multiple Copies from the File menu.
2. Click Load Image File. A window appears containing the image file names.
3. Select the name of the image file you want to copy and click Open.
4. When the image file is loaded, click Make A Copy to start copying. (If you are making multiple copies, this button is called Make Some Copies.)
5. Insert a blank disk in the floppy disk drive to receive the newly created disk contents. When the wristwatch pointer changes back to the arrow pointer, disk duplication is complete. If you are making multiple copies, insert each blank disk in turn.

1. Choose Single Copy or Multiple Copies from the File menu.
2. Insert a master floppy disk to copy from into the floppy disk drive.
3. Click Read Master Floppy to read the contents of the master disk.
4. When the image file is loaded, click Make A Copy to start copying. (If yo are making multiple copies, this button is labeled Make Some Copies.)
5. Insert a blank disk in the floppy disk drive to receive the newly created disk contents. When the wristwatch pointer changes back to the arrow pointer, disk creation is complete. If you are making multiple copies, insert each blank disk in turn.

1. Insert the floppy disk that you want to duplicate into the floppy disk drive.
2. Click Read Master Floppy.
3. After the contents of the floppy disk have been read, choose Save Disk Image from the File menu.
4. In the window provided, give the image file a name, and click Save.