So I upgraded the HDD in my 2013 2TB Time Capsule to a 4TB. It is possible but about the same level of difficulty as a hard drive replacement in a Mac mini if you have done that. You will need some very thin spudgers to get the base off.
Also there are a few thin wire connectors that are not for the faint hearted.
Drive used (see EDIT at bottom of post): Seagate Barracuda 4TB 7200rpm (ST4000DX000). It is a hot running drive but does not appear to heat the TC up at all (any different to the 2TB). Even with doing the initial backup of 5 Macs at once it did not get hot. I am guessing the writing speed is not challenging for it, or the internal fan is efficient.
Drive replaced: The drive in the Apple AirPort Time Capsule 2TB is the Seagate ST2000DM001. See http://www.seagate.com/au/en/internal-hard-drives/desktop-hard-drives/desktop-hdd/?sku=ST2000DM001. It is a 7200rpm SATATIII 64MB cache 3.5" HDD.
A few tips worth noting:
1. Find a very thin plastic, but stiff, spudger to get the base of. Two or more would help. The black base is a soft plastic and is marked easy.
2. You need a torx kit. 8 from memory.
3. Connectors are very delicate. I used long tweezers as I have used on minis and MacBooks in the past.
4. I left the sata cable attached to the logic board and only levered it off the HDD.
5. HDD is a snug fit. I removed it by holding the device end gently letting the HDD drop out the bottom, being super careful it does not grab wiring. Move it left and right to ease it from the rubber edges holding it in inside.
5. The HDD is only held in with rubber. You may need to reposition the rubber up inside the unit with say a driver before you fit the drive back in. It is very snug because the 4TB drive has a little more alloy on the edges. It fits fine though. There is no forcing it.
6. Upon rebooting the TC, you rebuild the HDD disk image through the airport app disk tab by choosing erase. You can rename it then.
I would not recommend it though unless you really want the hard drive space like me. It is a fragile operation - but still doable. Complications could be ripping of the connectors or wires.
I want to be able to use Time Machine from my 5 Macs on one Time Capsule which I can now do without issue. Yes I know you can plug in the 4TB to the USB port but I want to have it all internal and clean.
Also I had a 4TB lying around. A 2TB TC purchase plus a 4TB HDD would not be cheap.
You also need to rebuild the HDD through 'erase' in the AirPort App when you boot back into the TC.
I used the iFixit teardown for a general reference.
http://www.ifixit.com/Teardown/AirPort+Extreme+A1521+Teardown/15044/1
http://www.ifixit.com/Teardown/AirPort+Time+Capsule+A1470+(Mini!)+Teardown/15067/1
EDIT: Removed the comment I originally made that the AE does not support TM. See P13 of the manual. It is now supported on the 2013 AE.
EDIT II: Replaced the Seagate Barracuda ST4000DX000 5 platter 7200rpm HDD with a Seagate Desktop HDD.15 ST4000DM000 4 platter 5900rpm. The DM (newer drive) uses less energy and runs cooler than the DX. The DM is a touch slower than the 7200 DX but because the drive is over ethernet (and in the TC) the speed difference between the two is irrelevant. You can't really buy the DX anymore anyway unless it is old stock. Also the chassis of the DM is slightly thinner at the edges (being 4 platter) than the DX and is closer to the OEM TC drive in size than the DX. Although the difference between the DX and OEM drives is only a few mm. The DX still fits fine but the DM is just a touch better for size.
See comparison:
http://lime-technology.com/forum/index.php?topic=26140.0
Also there are a few thin wire connectors that are not for the faint hearted.
Drive used (see EDIT at bottom of post): Seagate Barracuda 4TB 7200rpm (ST4000DX000). It is a hot running drive but does not appear to heat the TC up at all (any different to the 2TB). Even with doing the initial backup of 5 Macs at once it did not get hot. I am guessing the writing speed is not challenging for it, or the internal fan is efficient.
Drive replaced: The drive in the Apple AirPort Time Capsule 2TB is the Seagate ST2000DM001. See http://www.seagate.com/au/en/internal-hard-drives/desktop-hard-drives/desktop-hdd/?sku=ST2000DM001. It is a 7200rpm SATATIII 64MB cache 3.5" HDD.
A few tips worth noting:
1. Find a very thin plastic, but stiff, spudger to get the base of. Two or more would help. The black base is a soft plastic and is marked easy.
2. You need a torx kit. 8 from memory.
3. Connectors are very delicate. I used long tweezers as I have used on minis and MacBooks in the past.
4. I left the sata cable attached to the logic board and only levered it off the HDD.
5. HDD is a snug fit. I removed it by holding the device end gently letting the HDD drop out the bottom, being super careful it does not grab wiring. Move it left and right to ease it from the rubber edges holding it in inside.
5. The HDD is only held in with rubber. You may need to reposition the rubber up inside the unit with say a driver before you fit the drive back in. It is very snug because the 4TB drive has a little more alloy on the edges. It fits fine though. There is no forcing it.
6. Upon rebooting the TC, you rebuild the HDD disk image through the airport app disk tab by choosing erase. You can rename it then.
I would not recommend it though unless you really want the hard drive space like me. It is a fragile operation - but still doable. Complications could be ripping of the connectors or wires.
I want to be able to use Time Machine from my 5 Macs on one Time Capsule which I can now do without issue. Yes I know you can plug in the 4TB to the USB port but I want to have it all internal and clean.
Also I had a 4TB lying around. A 2TB TC purchase plus a 4TB HDD would not be cheap.
You also need to rebuild the HDD through 'erase' in the AirPort App when you boot back into the TC.
I used the iFixit teardown for a general reference.
http://www.ifixit.com/Teardown/AirPort+Extreme+A1521+Teardown/15044/1
http://www.ifixit.com/Teardown/AirPort+Time+Capsule+A1470+(Mini!)+Teardown/15067/1
EDIT: Removed the comment I originally made that the AE does not support TM. See P13 of the manual. It is now supported on the 2013 AE.
EDIT II: Replaced the Seagate Barracuda ST4000DX000 5 platter 7200rpm HDD with a Seagate Desktop HDD.15 ST4000DM000 4 platter 5900rpm. The DM (newer drive) uses less energy and runs cooler than the DX. The DM is a touch slower than the 7200 DX but because the drive is over ethernet (and in the TC) the speed difference between the two is irrelevant. You can't really buy the DX anymore anyway unless it is old stock. Also the chassis of the DM is slightly thinner at the edges (being 4 platter) than the DX and is closer to the OEM TC drive in size than the DX. Although the difference between the DX and OEM drives is only a few mm. The DX still fits fine but the DM is just a touch better for size.
See comparison:
http://lime-technology.com/forum/index.php?topic=26140.0
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