The GoFlex Satellite drive requires an NTFS partition to operate properly in wireless mode.
If the drive has been formatted to HFS+ (MacOS Extended) it should be formatted back to NTFS.

Formatting the drive will erase all data on the drive. Be sure to copy anything you want to keep before proceeding.

Details for formatting the drive to NTFS in MacOS

1. Plug in the GoFlex Satellite drive and copy any data you want to keep to another drive.
   Be sure to eject and disconnect any other USB drives before proceeding.
2. Install the NTFS driver that shipped with the GoFlex Satellite (if you have not already).
   The file can be found on Seagate's download page if needed.
   for instructions on installing the NTFS driver, please see Document ID: 216511.
3. Click Go in the top Apple menu bar.
   
   
4. Choose Utilities.
   
   
5. Double-click Disk Utility. This will open a new window.
   
   
6. Select the GoFlex Satellite drive.
   It should be listed as Seagate USB, but be sure to choose the correct one.
7. Choose the Erase button.
   
   
8. For Format type, choose Windows NT File System.
   Do not choose the compressed option.
   
   
9. Enter a recognizable volume Name, like GoFlex Drive.
   This is the name that will appear on the Desktop when the drive is connected to the Mac.
   Formatting the drive will erase all data on the drive. Be sure to copy anything you want to keep before proceeding.
10. Click Erase to format the drive as NTFS.
11. After a few minutes the drive should be ready to use. You may need to eject the drive (drag it to the trash can), disconnect, and reconnect it to gain full read and write capability.