I always took it as its like a computer shut down and restart, clears everything, although know that in iOS the apps you had running are still there
I'm not sure how to tell what the running memory is before and after.
A quick Google gave interesting results. Very slightly risky and a normal shutdown does more. So it seems, better to quit all apps, them do a normal restart, although if you are having lockup issues, you will need to force it
12 down vote
A force restart is at the hardware level, not the software level. This means that even if iOS is completely frozen or in a different mode altogether (such as DFU Mode, Recovery Mode, or Restore Mode), you can still perform a force restart. It does nothing more than cut the power and turn the device back on again. This means that it doesn't clear any caches or reset anything. A regular restart actually does more than a force restart.
The "Hard Reset" is a useful troubleshooting feature, because it's very often the only way to restart an iOS device that's malfunctioning. Normally it isn't advisable to do it for the same reason as on a Mac: it may cause corruption. But it's definitely a useful thing to know how to do for the times you need it. It actually does less than a regular restart, because it prevents the OS from following normal shutdown procedures. Not a great thing to do on a regular basis and there are better ways to force a filesystem check of the device without potentially causing data files to be left in an inconsistent state.
From: "bim.bousman@gmail.com [apple-iphone]"
To: apple-iphone@yahoogroups.com
Sent: Monday, 11 January 2016 3:45 PM
Subject: [apple-iphone] Restart via power cycle vs Forced Restart Curiosity Question
I know this much:
1) Holding the Sleep-Wake button until the power off slider shows and then sliding it causes power off, and then holding the Sleep-Wake button again makes it start again.
2) Holding Sleep-Wake and Home buttons simultaneously until the Apple Logo shows should force a restart even if option one does not work.
My question: Once the restart is happening, does option two actually do anything different than what option one does? Are there any things inside that are getting reset under option two that do not happen with option one? I poked around in the Apple Knowledge Base for awhile but I did not find an answer to this question. My guess is that "No. They both do the same thing while starting back up again."
I did see the place in the Apple Knowledge Base where it says that doing a forced restart while connected to iTunes with the USB Cable and holding it long enough can cause a fresh re-load of iOS... but nothing about the different ways to make it restart.
Bim B
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Posted by: Tony <tdale@xtra.co.nz>
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