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Windows 7: What's on that 100MB partition? Can I delete it?

17 Oct 2010   #51
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate
 
 

Quote   Quote: Originally Posted by Night Hawk View Post


I'm surprized no one has written a guide for removing the 100mb system reserved partition and the manual method for building a new BCD store once the next partition present on the drive like the C primary is expanded to fill in the vacant space.


Hey Night Hawk ol' buddy, where you been mate?

Have a look at Option Two in this tutorial at the link below.


Partition Wizard : Use the Bootable CD


My System SpecsSystem Spec
.
17 Oct 2010   #52
mesteele101

Windows 7 Ultimate 64bit
 
 

Quote   Quote: Originally Posted by Bare Foot Kid View Post
Quote   Quote: Originally Posted by mesteele101 View Post
The three things that would be lost by trying to remove and recover the 100MB partition is;

1) Screws the drive alignment

Note: Use Paragon Alignment Tool or ArgusMonitor to check alignment.

2) Recovery Console at bootup

3) Bitlocker support (if you really need it)

The MBR is not a problem, just run recovery console from the Windows 7 DVD

Once you remove the partition it can NEVER be rectreated. The only way to restore it from scratch is to reinstall Windows 7.

This is not correct at all, have a look at these 2 threads for further information.


Boot Windows 7 from a Logical Partition

Boot Windows 7 from Logical

The referance above to the partitions is not the way Windows 7 creates a partition for a new install on a new drive. On a fresh install if you choose to use the complete drive you will end up with two partitions. There will be a 100MB "System Reserved" hidden partition, and a second partition containing the remainder.
My System SpecsSystem Spec
17 Oct 2010   #53
mesteele101

Windows 7 Ultimate 64bit
 
 

Quote   Quote: Originally Posted by Bare Foot Kid View Post
Quote   Quote: Originally Posted by Night Hawk View Post


I'm surprized no one has written a guide for removing the 100mb system reserved partition and the manual method for building a new BCD store once the next partition present on the drive like the C primary is expanded to fill in the vacant space.


Hey Night Hawk ol' buddy, where you been mate?

Have a look at Option Two in this tutorial at the link below.


Partition Wizard : Use the Bootable CD
Before people start removing that 100MB "System Reserved" partition they should be informed about drive alignment issues associated with Windows 7. Alignment issues can also be associated with other add on drives that have not been prepaird properly for Windows 7.
My System SpecsSystem Spec
.

17 Oct 2010   #54
Ztruker

Windows 10 Pro X64
 
 

For anyone else like me that did not know what TPM was, read here: Windows Trusted Platform Module (TPM)
My System SpecsSystem Spec
17 Oct 2010   #55
Night Hawk

W7 Ultimate x64/W10 Pro x64 dual boot main build-remote pc W10 Pro x64 Insider Preview/W7 Pro x64
 
 

Quote   Quote: Originally Posted by Bare Foot Kid View Post
Quote   Quote: Originally Posted by Night Hawk View Post


I'm surprized no one has written a guide for removing the 100mb system reserved partition and the manual method for building a new BCD store once the next partition present on the drive like the C primary is expanded to fill in the vacant space.


Hey Night Hawk ol' buddy, where you been mate?

Have a look at Option Two in this tutorial at the link below.


Partition Wizard : Use the Bootable CD

What I was referring to was a separate guide which wouldn't be for how to use one program for several things but how to get things regardless of which partitioning program or even the DiskPart to remove the 100mb.

That would also include instructions for use of the command prompt option when booted live from a 7 dvd, usb install key, or a repair cd as well as the commands to enter there providing the use of software and using the manual method by command prompt for building a new BCD store as well as use of the Fixboot and Fixmbr commands.

"Options to Rebuild or Build New the Bootsector/BCD store" would be a suitable title! In a guide like that you would want to introduce more then one option.

In fact for the next full system image I'll likely see two one with and the other without the 100mb seen.
My System SpecsSystem Spec
17 Oct 2010   #56
madtownidiot

 

The only time I would recommend removing the 100MB system reserved partition is during the initial windows 7 install, if you plan to add a 2nd OS in a dual boot option on a single HDD system. In that situation it's a good idea to have a media partition to share files between the two operating systems, and to hide the other windows system partition from explorer in each OS. Logical partitions seem to cause more trouble than they're worth if you have more than one version of windows installed on the same HDD.
My System SpecsSystem Spec
17 Oct 2010   #57
Night Hawk

W7 Ultimate x64/W10 Pro x64 dual boot main build-remote pc W10 Pro x64 Insider Preview/W7 Pro x64
 
 

Typically what many are doing now for single drive systems when going to dual boot is use an external drive for storing files and backups there including the option for a full system image while maintaining the two primaries. When splitting up a drive further for a 3rd storage partition the best advice is to see that done on a large capacity drive rather then running out of drive space too fast on a small one.

Depending on how much storage space is needed a good size drive starts off at 640gb or larger for two OS and one storage partition. "That dreaded "out of memory" error came up. Why?" many ask when they don't plan out enough drive space and their OS primaries fill up too fast.

As for removing the 100mb partition the task of seeing a brand new BCD store and new mbr entries is the task there where the "boot" folder is then found on C no longer having the 100mb present. You have to make the drive bootable again once the 100mb of drive space is reclaimed. I know Bare Foot Kid will be pointing to using the PW live cd for seeing that done while for those using another partitioning program the manual command pormpt method is more universal but still manually seen to at a command prompt.
My System SpecsSystem Spec
17 Oct 2010   #58
madtownidiot

 

If you delete the system reserved partition using the drive options menu in the windows installer after allocating two other NTFS partitions, you don't have to worry about making the drive bootable because the MBR, & BCD will be written to the partition you install windows 7 to instead. It's only if you delete the system reserved partition after the install is complete that you have any problems... but if you subsequently install XP or vista immediately after installing windows 7, easyBCD can make both partitions bootable without having to do startup repair.
My System SpecsSystem Spec
17 Oct 2010   #59
Night Hawk

W7 Ultimate x64/W10 Pro x64 dual boot main build-remote pc W10 Pro x64 Insider Preview/W7 Pro x64
 
 

With an XP/7 dual boot you would still need to create a brand BCD store if the 100mb partition is removed since the 7 installer places the store there instead on the main primary(7). You can't add 7 into the XP boot loader leaving you with just XP.

Following the instructions seen on the MS page for using the bootrec.exe tool at the command prompt you would build a new store to seen in the boot folder on the primary. The image attached here points to where that will be seen once a new store is created once the 100mb system reserved partition is removed.


Attached Images
What's on that 100MB partition? Can I delete it?-boot-folder-1-not-found.jpg 
My System SpecsSystem Spec
17 Oct 2010   #60
mjf

Windows 7x64 Home Premium SP1
 
 

Quote   Quote: Originally Posted by madtownidiot View Post
If you delete the system reserved partition using the drive options menu in the windows installer after allocating two other NTFS partitions, you don't have to worry about making the drive bootable because the MBR, & BCD will be written to the partition you install windows 7 to instead. It's only if you delete the system reserved partition after the install is complete that you have any problems... but if you subsequently install XP or vista immediately after installing windows 7, easyBCD can make both partitions bootable without having to do startup repair.
I know i'm like a dog with a bone here but for BIOS boot PCs the MBR is fixed in location on the first sector of the boot HDD (or first 512 bytes of any boot device). You cannot move it and it doesn't live in a partition including the 100MB system reserved. For the last 25 years that's where the BIOS is programmed to look for it.
Here is mine - small enough to type the Hex code if really desperate.
You can see some error messages the BIOS spits out.


Attached Thumbnails
What's on that 100MB partition? Can I delete it?-mbr.jpg  
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 What's on that 100MB partition? Can I delete it?




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