Is it necessary to install application on system drive always?

would it be better if program files folder is in non-OS drive? (for performance sake)
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I usually install software to other locations, not the C:\ partition. I do that as I want to separate the OS from the rest, and also because I often have more than one OS installed, if the programs are installed within every OS I can save space that way. A further reason is that this way I can leave the OS partition small and don't have to worry about needing more space on it when I add additional software. This doesn't normally improve performance, unless you have different physical disks.
25112Author Commented:
that's good to know, rindi.

for win7, (if you have only one OS) and you installed applications on separate drive and put files on separate drive, what is the optimal space to keep for the OS drive?
I usually go with between 25 and 30GB. It also depends a bit on your hardware. For example if it is a lpatop and you use hibernation, the hibernation file is on the OS partition and it will need to be about the size of your RAM.

The OS itself fits on about 12GB...
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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
>>  What is the optimal space to keep for the OS drive?

You haven't allowed for your data.  Where are you going to keep that?  On a third drive?  And 64 bit OSes need about 20% more than 32 bit OSes.

Windows 7 to 10 require about 16 Gb (20 Gb if 64 bit) according to Microsoft of space.  For your base Windows OS I'd allow three to four times of what Microsoft recommends.  That allows for service packs, patches, drivers, swap files and lots and lots of breathing room.  Don't skimp.  Storage is cheap.

What I recommend is keeping your OS and Program files on one disk (or partition) and data on a second disk or partition.  Your data is usually the most volatile (likely to change) and keeping that away from the other makes it easier to defrag and backup.

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Gary CaseRetiredCommented:
I don't agree with installing programs on a different drive or partition.

I install the OS and all programs on my primary (C:) drive ... but relocate the data files to another drive  [Documents, Favorites, Pictures, Videos, Music, etc.].

There's NO performance difference in doing this (especially if the system drive is an SSD) ... in fact, installing programs on a different partition will be SLOWER with a rotating drive, since it will require a longer seek to the other partition.

There's a very nice advantage to structuring as I noted:  

(1)  You can IMAGE the C: drive and it will include your complete setup ... the OS, all programs, etc. => so if the system ever gets corrupted, you can simply restore that image and all's well.

(2)  You can backup all of your data by simply mirroring/copying the data partition

So if you had some significant corruption (i.e. a nasty virus), you simply restore the C: partition -- your data will already be intact.
i also use the system explayned by Garycase
>>  Is it necessary to install application on system drive always  <<  is it necessary?  NO
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