Protip: Storage capacity in technology always refers to the actual unformatted/raw capacity. Actual formatted capacity will decrease storage space differently depending on the file system.
Even on bandwidth and net speeds advertised by ISPs or carriers, they usually are theoretical speeds that exclude all sorts of real world variables.
Back on topic:
The iOS partition is approximately 1.1GB on an iPhone 4. (8GB-1.1GB) I've got an iPhone 4.
Let's assume the disk format is eating 400MB. (6.9GB-400MB =6.5GB)
iOS settings/user profile data/ and other misc data usually accumulates on the phone at 30-80MB if it's healthy. Let's take the raw figure before installation of any apps as 6.3GB. So it's fair.
On your other point, excessive other data is usually a result of incomplete installation of apps that are not purged out of the storage, you can call it a bug.
Sometimes "Others" can be ridded through
- Restarting the phone.
- Installing another iOS app.
- Syncing with its host computer probably up to 10 times.
If nothing works, it's unfortunate that your computer backup file might have also stored the "Other" junk as part of your data.
To start afresh,here's a discussion which probably will help.
In the future, if you're installing an app, try to download an app only when you're at a stable connection to prevent recreation of "other" junk.
Sagar RKothari wrote:
I am wondering, If I remove entire iOS5 & install iOS5 on my iPhone4 again, that should work.
Definitely, if you do not use the backup. You'd have to roll a dice if you're usin a backup.
Sagar RKothari wrote:
Q.5 ) How do I re-install iOS5 ? ( Please I don't need any updates here. I am very much happy with iOS5 only )
You can conduct a factory reset (Restoration to settings you had when you first got the iPhone). However, all user profile/data will be wiped unless you backed them up to iCloud or so.
Settings->General->Reset->Erase all content and settings.
Note: You can no longer conduct a real 'flushing' or reinstallation of iOS5 because Apple has moved on and no longer validates iOS5.0 with their servers, thus making an iOS5.0 reinstallation impossible. The earliest "reinstallation" you can get is iOS5.1. But if you're all in for better battery performance etc, don't take the risk of upgrading.
Final note: In your case, a factory reset would solve your frustrations totally.