It is unknown that the issue is a particular manufacturer's hard drive or not. But as Kappy has mentioned, it comes down to Apple not supporting Time Machine on drives attached to the AirPort Extreme, but they DO support drives attached to the Time Capsule ... so just getting a Time Capsule MAY resolve the issue.
Apple doesn't support Time Machine backups to an external HDD (aka, AirPort Disk) attached to the USB port of the Extreme regardless of how the Extreme is connected in a network. Again, they do support that same HDD attached to the TC's USB port. As far as connectivity with the Express, both the Extreme and TC are interchangeable. Basically the only difference between them is that the TC has an internal HDD.
You should be aware that Apple still has a discrepancy in its KB articles regarding TM support for USB disks attached to the TC's USB port.
From Uses for the USB port of Time Capsule, AirPort Extreme, AirPort Express (Last Modified: Jan 31, 2012)
- Single self-powered USB hard disk (with support for Time Machine backups)
From Mac Basics: Time Machine (Last Modified: Nov 16, 2012)
Time Machine can’t backup to an external drive that's connected to an AirPort Extreme, Time Capsule, or a drive formatted for Microsoft Windows ...
I happen to know earlier versions of that article did not mention Time Capsule in this list of excluded devices. It is a recent change. We can only speculate why the KB article was modified to exclude this option. The discrepancy precludes a definitive answer.
This remains certain: Time Machine is unreliable with a HD connected to an AEBS.
can you two speak english lol. I got a usb hard drive thing it has TB or what ever 1000gb is. and i try to turn on time maching it turns it self off. I try to back up it says disk cannot be found or somthing like that. It also had the delayed thing. I tried selecting the disk but that doesnt work either. Can someone help me?
can you two speak english lol.
If you'll be specific instead of talking about "things" and "somthing" (sic) and "doesn't work."
Remember, we can't see over your shoulder or read your mind from here.
I got a usb hard drive thing
You've posted in the Airport forum, so is it connected to An Apple Airport Extreme? If so, directly or via a USB hub? If so, is it powered? Does the drive have it's own power supply?
Or is it connected to an Apple Time Capsule? Or directly to your Mac? Or something else (ie, what)?
How is it formatted?
and i try to turn on time maching it turns it self off. I try to back up it says disk cannot be found or somthing like that.
What does it actually say? If you're not sure, post a screenshot.
I tried selecting the disk but that doesnt work either.
What do you mean by "doesnt work"? What happens, or doesn't happen. Any messages? If so, what, exactly?
Or, perhaps, you might want to see one of these for detailed instructions: