Home user of iMac

Hi, I'm a home user of iMac. I got several question of using iMac (I'm new to mac). So here it is:
1. Like mention above, I'm a home user of iMac and working outside, on weekdays I only use iMac for 5-6 hours and whole day on the weekends. Should I put it sleep or shut it down when I going to sleep and leaving for work in the morning? will putting it to sleep will increase my electric bill?
2. I read a lot of post about their iMac making sound. Are every iMac suppose to work as silent as death? I try to hear mine, it does making "bzzzzz" sound but only if I stick my ear to iMac.
3. I can't delete file from external hd. It work fine in windows.
4. In windows usually I run disk defrag every week to keep windows performance, what must I do to keep Mac performance?
Thanks in advance

1. In your case, I would use Computer Sleep (which you can do from the Apple Menu) when you are done for the day. Sleep does not use a significant amount of power. It's like a laptop in sleep mode, which drains the battery very slowly; the drain is more than a shut down state, but it is still minimal. For an iMac, it is almost nothing; even an iMac that is connect to power and turned off pulls some power.
Once you wake the iMac and start using it for the day, you should have it set to do Display Sleep, but not Computer Sleep. A lot of users have the iMac go to sleep after X minutes of inactivity, but that makes the iMac sleep and wake repeatedly during the day, and I think that puts more stress on the hardware. So I think one wake at the start of the day and one sleep at the end of the day, with the iMac running in between (with the Display Sleep after X minutes), is best. You can set it up that way in System Preferences +Energy Saver+ pane.
2. If you have to put your ear on the iMac to hear it, it is fine. The hard drive and fans will make some noise, as they spin, even if they are mostly silent.
3. If the hard drive is formatted as NTFS, Mac OS X can read it but not write to it (or delete files from it). If that drive is going to be used only on the Mac going forward, it should be re-partitioned and reformatted for Mac. I can provide more details; just post back.
4. As longs as you keep a good amount of free space on the internal drive, you should not have to worry about doing defrags. Mac OS X defrags smaller files automatically in the background. Larger files and free space are not defragged, but as long as the free space on the drive is large, that will not become a problem for a long long time. It would be best if at least 20% of the startup disk capacity was free space. If it gets closer to 10%, you need to look for ways to off-load some of that data. If it gets below that level, the remaining free space will start to get badly fragmented into tiny pieces, and that can affect Mac OS X performance. Mac OS X uses free space on the startup disk for its operations.

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