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Windows 7: OEM (Reserved) Partition -- What is it ??

30 Jul 2010   #1

Windows 7 Home Premium 64-Bit
 
 
OEM (Reserved) Partition -- What is it ??

I am ready to perform a clean install of Windows 7 and I am going to delete my C: and D: partition (see screen shot) under Custom (Advanced). There is another partition that states "OEM (Reserved)" and it is only 54.0 MB. I have a Dell E1705 currently running Windows Vista. The D: partition is a recovery partition.

What is this OEM (Reserved) partition and can I delete it? What are the consequences if I do? And what makes it "OEM Reserved" ??





Attached Thumbnails
OEM (Reserved) Partition -- What is it ??-oem.jpg  
My System SpecsSystem Spec
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30 Jul 2010   #2

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by osu1357 View Post
I am ready to perform a clean install of Windows 7 and I am going to delete my C: and D: partition (see screen shot) under Custom (Advanced). There is another partition that states "OEM (Reserved)" and it is only 54.0 MB. I have a Dell E1705 currently running Windows Vista. The D: partition is a recovery partition.

What is this OEM (Reserved) partition and can I delete it? What are the consequences if I do? And what makes it "OEM Reserved" ??


Dell puts a fat32 partition first to park its own software. Usually it is for things like the bells and whistle buttons. My dell has media buttons on the front that require software to be loaded first in order to run.


Can you delete it, but, the "dell" media utilizes may not work
My System SpecsSystem Spec
30 Jul 2010   #3

Windows 7 Home Premium 64-Bit
 
 

I haven't tried to delete it... What happens if I do? Should I leave it on there?

Actually I tried to delete it inside Vista Disk Management and I cannot ... why ???

What software is on there? There's no drive letter assigned..

Would I get a bad install if I left it on there?
My System SpecsSystem Spec
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30 Jul 2010   #4

Windows 8 Core X64
 
 

It's Dell diagnostics. Wouldn't hurt to leave it there and no, it will not give you a bad Windows 7 install by doing so.
My System SpecsSystem Spec
30 Jul 2010   #5

Windows 7 Home Premium 64-Bit
 
 

1) If you look at my screen grab (1st post) of my partitions why don't they add up to 80.0 GB? They add up to 74.5 GB ... When I ordered my Dell laptop it was supposed to have an 80 GB hard drive.. Is there a hidden partition that I am not seeing ?

2) Here's another question.. Why are the partition types all different? There's an OEM Reserved, a Primary and a System ... How do I label the partition types? Is it automatic?

3) Also when deleting a partition is there a certain order i need to do it in? For example, if I delete the D: partition, do I have to Extend the C: partition to accept the new space?
My System SpecsSystem Spec
30 Jul 2010   #6

MS Windows 7 Ultimate SP1 64-bit
 
 

Post a snippet of the output of DISKMGMT.MSC
My System SpecsSystem Spec
31 Jul 2010   #7
Microsoft MVP

 

The HP and Dell OEM partitions house bootable Diagnostics available on their BIOS Boot menu keys - F9 for HP and F12 for Dell.

For this reason it's worth leaving them on the drive although HP will sometimes not boot after a reinstall, but Dell will. Booting into the Dell F12 Utility partitions gives a wide range of hardware tests that are definitely worth keeping.

However Dells' Recovery partition will not run after a Reinstall so can be deleted along with System and C partition during a Clean Reinstall - Factory OEM Windows 7 using the Custom install Drive options, then create your new install and other desired partitions in the space.
My System SpecsSystem Spec
31 Jul 2010   #8
mjf

Windows 7x64 Home Premium SP1
 
 

Re: the 80GB
1KB = 1024 bytes
1MB = 1024 KB
1GB = 1024 MB

74.5 GB by (1.024x1.024x1.014) = 80,000,000,000 bytes

A bit of a con but most manufacturers seem to do it. Buy a 500 "GB" HDD and you actually will see 465 GB.
My System SpecsSystem Spec
31 Jul 2010   #9
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

A
Quote:
bit of a con but most manufacturers seem to do it
It is not a con at all. Just a difference between the decimal and binary number representation. I don't think the world is ready to have the binary numbers printed on the shopping boxes. We are still a decimal world - but the computer does not understand that.
My System SpecsSystem Spec
31 Jul 2010   #10
mjf

Windows 7x64 Home Premium SP1
 
 

Of course it's to do with the binary system!!!!!!!!!!
But some people do get confused hence the question raised by the original poster.
This is a technical forum not a supermarket.
My System SpecsSystem Spec
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 OEM (Reserved) Partition -- What is it ??




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