Wi-Fi and USB connection issues can have many origins, it's by nature a complex process that is hard to troubleshoot sometimes. Often also the problem is the same in iTunes and affects DiskAid likewise.
If a device fails to show up in DiskAid it might well be an issue with the Apple Mobile Device Service on the computer itself.
You can make sure this is a Mobile Device Service issue if you open iTunes and see that the device does not show up in there either, but to ensure best results and fix such issues:
- First of all open DiskAid's Preferences and click "Restart Mobile Device Services" and see if it solves the problem.
- If it still doesn't work reboot both the computer and device. If you want to use the Wi-Fi connection, make sure both your device and your computer are connected to the same Wi-Fi network, also Reboot (power off) the network router.
- If nothing of this works, apply the following procedures for Mac OS X or Windows.
Mac OS X
- Click on the top menu of Mac OS on the “Apple” icon and click “Software update…”
- Launch iTunes and select in the top menu “Check for Updates…”
- If you are using iTunes, launch iTunes and go in its Menu Help and click “Check for Updates”. Try to launch DiskAid again.
- If it still doesn’t work go to DiskAid’s Preferences and click “Reinstall Apple Mobile Device Support”. During the process you will be asked to remove “Apple Mobile Device Support”, please follow wizard's steps. Then DiskAid will automatically reinstall it for you. Reboot both your device and your computer and gives it an other try.
- If no luck make sure you don’t have a security tool such as ZoneAlarm Firewall blocking DiskAid, many of these tools are bad and uneeded because there is already a Firewall embedded in Windows Vista, 7 and 8. If you still want to use a special firewall software make sure to add DiskAid in its trust list.