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How much free space should I leave in OS partition ?

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I just got a new PC with following configuration and have made 9 partitions on my 500 GB hard disk and

have 2nd 500 GB HDD as slave with 2 partitions, one has Win -7 Ultimate & 2nd partition is where I store Movies & Video Files.

The OS Partition is 100Gb & I have installed all applications in OS Partion.

All the applications with Win -7 Ultimate 64 bit has taken up 50 GB space.

I do download some stuff everyday & it goes in Downloads folder & takes up upto 25 GB of space.

Thus I am left with 25 GB free space.

In order to have a lightening fast performance, how much free space should I leave in the OS Partitions ?

Here are the specs of my system :

Intel Core i-7 2600 Sandy Bridge ( 3.4 GHz ) Processor

8 GB DDR3 SDRAM 1333 MHz

Windows -7 Ultimate ( 64 bit )

500 GB Sata 3.0Gb/s HDD

Second 500 GB HDD which I am using as a slave drive to store Movies etc.

Creative PCI Express Sound Blaster X-Fi™ Xtreme Audio

Hauppauge® WinTV-HVR-1200 Hybrid Analog/Digital TV Tuner

1 GB NVIDIA® GeForce® GT420 as default video card.

Thank You.
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Rule of thumb is to never let your free space fall below 12 to 15 percent on your OS partition.
AT your present description you are at 25%.
Anything lower the 12 will possibly corrupt your MFT and your system may not boot correctly.
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Sent via a pm.

Thank You for your help.

I have one more question :

Are 9 Partitions on a single HDD too many ?

One of my partition has 150 GB data. Is it wise to put that much data in a single folder ?

Thanks again.

That is more then I would put on a drive. I have a 500 gig hd with 3 partitions on it with 3 different OS's.
I would have put the 500 in for just OS's. Then had a larger 2nd drive split up into 4 250 gig partitions for data of different types.
The question is does it all work with no problems? If you make sure that no OS drive drops below 15% free space you should be ok.
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