| Windows 7: System Reserved Partition - Delete System Reserved Partition - Delete How to Delete the 100MB "System Reserved" Partition in Windows 7
Published 16 Mar 2010
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 Featured Tutorial | | | How to Remove the 100MB "System Reserved" Partition in Windows 7  Information The 100 MB System Reserved partition is included when doing a clean install of Windows 7 on an unallocated disk. The System Reserved partition serves two functions. First, it holds the Boot Manager code and the Boot Configuration Database. Second, it reserves space for the startup files required by the BitLocker Drive Encryption feature. If you ever decide to encrypt your system drive using BitLocker, you won’t have to repartition your system drive to make it possible.
This tutorial will show you how to delete the 100MB System Reserved partition created during the installation of Windows 7.  Warning This involves deleting the boot partition, then repairing. Failure to follow these instructions exactly may leave your computer in a non-bootable state.  Note - Make sure the C drive is a Primary partition before you begin. Type diskmgmt.msc into the start menu to access the above window.
- You must have a Windows 7 Installation or Repair disc to do this. If you do not have a DVD, you can create a Repair Disc.
EXAMPLE: 100 MB System Reserved Partition Here's How:  Note Press enter between each of these commands. 1. Boot from your installation or repair disc. 2. When you get to the language screen, press Shift+F10. 3. Enter diskpart, then list disk after diskpart is loaded. 4. Enter select disk [Windows disk number]. 5. Enter list partition, followed by select partition [100MB partition number]. 6. Enter delete partition override. 7. Enter select partition [Windows partition from step 5], then enter active. 8. Close the command prompt.We have deleted the partition, and Windows will be unable to boot at this point. Now it is time to write a new boot loader and BCD to the Windows partition. 9. Follow the instructions in Brink's tutorial for running a startup repair. That should do it! If you have any problems, feel free to ask for help below. | | | Need more help? Try searching our extensive help and support site.
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16 Mar 2010
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#1 | | |
JK - Good stuff, but wouldn't "bootrec /FixMbr" as step 8 (7A?) write out a new boot record and eliminate the need for step 9? | My System Specs |
| System Manufacturer/Model Number Gateway, Toshiba Laptop, and Home Brew OS Windows 7 x64 HP, Windows 7 HP, Windows 7 Ult CPU Intel I3, Cerelon, Pentium 4 @ 3Ghz Motherboard Intel, Intel, Asus Memory 8G, 3G, 3G Graphics Card On-board Intel, On-board nVidia, nVIDIA card Sound Card on-board, on-board, SoundBlaster Monitor(s) Displays Hannspree HF237, Toshiba, SyncMaster 931B Screen Resolution default (all) Keyboard standard wired (all) Mouse standard wired (all) PSU 300w, unk, 650w Case black, black, grey Cooling air (all) Hard Drives 1T internal, 320G internal, 160G internal, 1T networked Internet Speed 6M down, 768K up Other Info Home LAN through Linksys hub to 4 port and wireless switch/router. Networked HP 2600n. Wife's computer running Windows 7, and spare laptop running Ubuntu "Karmic Kola" (9.10). |
16 Mar 2010
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#2 | | |
Possibly Schaft, but that wouldn't rebuild the BCD.
Of course, you could also run bootrec /rebuildbcd, but I trust startup repair more.
To be honest, I don't have very much experience with bootrec, so I tend to recommend the startup repair. | My System Specs | | System Manufacturer/Model Number Custom OS Windows 7 Professional x64 CPU Intel i7 2600K OC'd @ 4620 MHz Motherboard Asus P8Z68-V Pro Memory 16GB GSkill Sniper 2133 Mhz (4x4GB) Graphics Card EVGA GeForce GTX 480 SuperClocked+ Sound Card Realtek High Definition Audio Monitor(s) Displays 2x Acer S273HLbmii 27" Screen Resolution 2 x 1920x1080 Keyboard Logitech MK320 (wireless) Mouse Logitech MK320 (wireless) PSU Corsair HW Series 750w (modular) Case Cooler Master HAF 932 Advanced Blue Edition Cooling CM Hyper 212+ CPU cooler, 3x 230mm + 1x 140mm case fans Hard Drives 64GB Crucial M4 SSD
Storage: Hitachi 1TB 5400RPM, Samsung 1.5TB 5400RPM Internet Speed 30 Mb/s : 2 Mb/s |
16 Mar 2010
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#3 | | |

Quote: Originally Posted by Jonathan_King Possibly Schaft, but that wouldn't rebuild the BCD.
Of course, you could also run bootrec /rebuildbcd, but I trust startup repair more.
To be honest, I don't have very much experience with bootrec, so I tend to recommend the startup repair. I can't say that I have a lot of experience with bootrec either, but I found it the fastest way to get rid of GRUB's multiple boot menu when I wanted to unload Ubuntu - just rebuilt the MBR and then went in under Windows 7 and deleted the partitions. | My System Specs | | System Manufacturer/Model Number Gateway, Toshiba Laptop, and Home Brew OS Windows 7 x64 HP, Windows 7 HP, Windows 7 Ult CPU Intel I3, Cerelon, Pentium 4 @ 3Ghz Motherboard Intel, Intel, Asus Memory 8G, 3G, 3G Graphics Card On-board Intel, On-board nVidia, nVIDIA card Sound Card on-board, on-board, SoundBlaster Monitor(s) Displays Hannspree HF237, Toshiba, SyncMaster 931B Screen Resolution default (all) Keyboard standard wired (all) Mouse standard wired (all) PSU 300w, unk, 650w Case black, black, grey Cooling air (all) Hard Drives 1T internal, 320G internal, 160G internal, 1T networked Internet Speed 6M down, 768K up Other Info Home LAN through Linksys hub to 4 port and wireless switch/router. Networked HP 2600n. Wife's computer running Windows 7, and spare laptop running Ubuntu "Karmic Kola" (9.10). |
16 Mar 2010
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#4 | | |
I found the 100mb of repair tools quite useful lately when the host drive's installation ran into a problem where Windows would stall at the logo screen. The automatic startup repair tool came to life on it's own plus the option to restore a system image created.
Note when originally partitioning the drive using GParted the separate 100mb section was never created. Instead the repair tools were somehow packed into the solid C primary. When partitioning the drive using the Windows drive tools during the installation however you see the 100mb section created.
Apparently using a 3rd party partitioning program is another option if you do not want the 100mb section created from the start. The image here shows hows the host drive looks in the DM without the 100mb being seen. Having the repair tools already on the drive however can eliminate the need for the 7 dvd when a problem comes up. Just something to pass along here. | My System Specs | | OS Windows 7 Ultimate x64, XP Mode, W8 RP VM, Linux Mint Debian 2nd OS HD- 7 Pro x64 second case CPU AMD Phenom II X4 975 Deneb 3.6ghz - 965 on new mini tower Motherboard Gigabyte GA-790XTA-UD4 Memory Kingston Hyper X DDR3 1600 1.5v 16gb - Mushkin on 2nd build Graphics Card MSI HD Radeon 5750 1gb - MSI HD Radeon 6450 on mini tower Sound Card Creative Labs X-Fi XtremeGamer - Realtek onooard 2nd case Monitor(s) Displays 2 x Acer P191W 19" widesscreen - HP 20" widescreen mini towe Screen Resolution 1440x900 native - 1600x1024 on 7 Pro x64 build Keyboard Microsoft Recusa Razor - MS Comfort 3000 on second build Mouse MS Trackball Explorer - A4TECH dual scroll wheel trackball PSU Corsair 750TX - primary / Corsair CX600 - second Case Antec 900-2 - SSD compatible / NZXT Vulcan mini tower Cooling Zalman CNPS9900A Hard Drives Primary Ultimate x64 build-
WD Black Edition 1tb Sata 6.0 = 2
WD Black Edition 1tb Sata 3.0 = 2 (OS drives)
WD 1tb Green Power sata = 2 1 external
usb flash drives = 18
Second 7 Pro x64 mini tower-
WD Caviar SE 500gb sata II single drive presen Internet Speed 30mbps upgrade - primary hard wired - mini tower usb WiFi |
16 Mar 2010
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#5 | | |
Apparently the 100MB partition is created when setup does not find any active partitions. | My System Specs | | System Manufacturer/Model Number Custom OS Windows 7 Professional x64 CPU Intel i7 2600K OC'd @ 4620 MHz Motherboard Asus P8Z68-V Pro Memory 16GB GSkill Sniper 2133 Mhz (4x4GB) Graphics Card EVGA GeForce GTX 480 SuperClocked+ Sound Card Realtek High Definition Audio Monitor(s) Displays 2x Acer S273HLbmii 27" Screen Resolution 2 x 1920x1080 Keyboard Logitech MK320 (wireless) Mouse Logitech MK320 (wireless) PSU Corsair HW Series 750w (modular) Case Cooler Master HAF 932 Advanced Blue Edition Cooling CM Hyper 212+ CPU cooler, 3x 230mm + 1x 140mm case fans Hard Drives 64GB Crucial M4 SSD
Storage: Hitachi 1TB 5400RPM, Samsung 1.5TB 5400RPM Internet Speed 30 Mb/s : 2 Mb/s |
16 Mar 2010
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#6 | | |
When you are first installing 7 on a new drive or one previously wiped no longer seeing a primary you would be using the MS drive tools options found on the dvd there. You will also note the 1-8mb of unallocated drive space for changing between the Basic type of volume used mainly on desktops or the Dynamic for server geared.
The MS drive tools also prepare the 100mb reserved as part of the installation for 7 to include the repair tools. When the drive is already seeing an active primary as you are pointing to the installer still places the repair tools tucked away at the beginning of the existing primary eliminating the need for the separate 100mb section.
I had initially been wondering if the repair tools wouldn't be available until seeing the startup repair come up while trying to debug a sudden hardware or lack of hardware detection problem. Suddenly no internet, no tuner card available, and the sound went out?
When interrupting a restore point the startup repair tool suddenly stepped in showing that the Windows installer still sucessfully placed them on the drive without the need for the 100mb taken away. The concern when removing the 100mb section when not having a 7 dvd would be the need to burn a repair cd with 7 fortunately now seeing that option included!
The 3 cards were simply removed and reseated to suddenly hear ping, ping, ping "you must restart to see the changes put into effect"! when the system was started afterwards. Windows 7 again solved it's own dilemna with the fresh detection as well as seeing the repair tools onhand having used a 3rd party drive tool.
For those who want to reclaim the 100mb of drive space be sure to burn a repair cd to have onhand since that can also save on handling the 7 dvd itself as well as for those not having one in the case of 7 being preinstalled. For those about to install 7 on a bare drive and want to avoid the 100mb being taken then the use of a 3rd party drive tool is something to consider as well. | My System Specs | | OS Windows 7 Ultimate x64, XP Mode, W8 RP VM, Linux Mint Debian 2nd OS HD- 7 Pro x64 second case CPU AMD Phenom II X4 975 Deneb 3.6ghz - 965 on new mini tower Motherboard Gigabyte GA-790XTA-UD4 Memory Kingston Hyper X DDR3 1600 1.5v 16gb - Mushkin on 2nd build Graphics Card MSI HD Radeon 5750 1gb - MSI HD Radeon 6450 on mini tower Sound Card Creative Labs X-Fi XtremeGamer - Realtek onooard 2nd case Monitor(s) Displays 2 x Acer P191W 19" widesscreen - HP 20" widescreen mini towe Screen Resolution 1440x900 native - 1600x1024 on 7 Pro x64 build Keyboard Microsoft Recusa Razor - MS Comfort 3000 on second build Mouse MS Trackball Explorer - A4TECH dual scroll wheel trackball PSU Corsair 750TX - primary / Corsair CX600 - second Case Antec 900-2 - SSD compatible / NZXT Vulcan mini tower Cooling Zalman CNPS9900A Hard Drives Primary Ultimate x64 build-
WD Black Edition 1tb Sata 6.0 = 2
WD Black Edition 1tb Sata 3.0 = 2 (OS drives)
WD 1tb Green Power sata = 2 1 external
usb flash drives = 18
Second 7 Pro x64 mini tower-
WD Caviar SE 500gb sata II single drive presen Internet Speed 30mbps upgrade - primary hard wired - mini tower usb WiFi |
08 Nov 2010
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#7 | | |
@Jk
After deletioin, it is seen as Unallocated space. How do I add this space to my system partition (C  ? Will Extend command under diskpart do the job?
Better yet, if u could provide the exact steps, would be nice. I dont wanna mess up with these things... | My System Specs | | System Manufacturer/Model Number HCL OS Winbdows 7 ultimate x64 | Ubuntu 12.04 x64 LTS CPU Core 2 Duo e7400 @ 2.90GHz Motherboard Gigabyte G31M-ES2L Memory 3GB DDR2 Graphics Card Asus Nvidia GTX 560Ti 1GB Sound Card On-board Monitor(s) Displays HCL eZeeBee 18.5" LCD Screen Resolution 1366x768 @ 60Hz Keyboard Stock Mouse Stock PSU Corsair CX500 V2 500W Cooling Stock Hard Drives Western Digital 320GB Internet Speed 15-25kBps D/L | 10kBps U/L | Hey Don't laugh |
08 Nov 2010
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#8 | | |
Hello EzioAuditore,
You will need to extend your C partition to include that space. The Windows Disk Management tool cannot extend space to the left of the volume, so you'll need to use a third-party tool. I recommend Partition Wizard Free Edition: Magic Server Partition Manager Software - Resize partition for Windows Server 2003, 2008 and 2000.
Using Partition Wizard, right-click on the C partition, and select Move/resize. Then drag the edge of the box to the left, to include that unallocated space.
When you're done, be sure to select Apply actions. | My System Specs | | System Manufacturer/Model Number Custom OS Windows 7 Professional x64 CPU Intel i7 2600K OC'd @ 4620 MHz Motherboard Asus P8Z68-V Pro Memory 16GB GSkill Sniper 2133 Mhz (4x4GB) Graphics Card EVGA GeForce GTX 480 SuperClocked+ Sound Card Realtek High Definition Audio Monitor(s) Displays 2x Acer S273HLbmii 27" Screen Resolution 2 x 1920x1080 Keyboard Logitech MK320 (wireless) Mouse Logitech MK320 (wireless) PSU Corsair HW Series 750w (modular) Case Cooler Master HAF 932 Advanced Blue Edition Cooling CM Hyper 212+ CPU cooler, 3x 230mm + 1x 140mm case fans Hard Drives 64GB Crucial M4 SSD
Storage: Hitachi 1TB 5400RPM, Samsung 1.5TB 5400RPM Internet Speed 30 Mb/s : 2 Mb/s |
08 Nov 2010
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#9 | | |
@JK
That's really a nice tool. But it's shareware and wont let me do my job until i register it.. Cant afford now. Any freeware alternative?
Thanks anyways. | My System Specs | | System Manufacturer/Model Number HCL OS Winbdows 7 ultimate x64 | Ubuntu 12.04 x64 LTS CPU Core 2 Duo e7400 @ 2.90GHz Motherboard Gigabyte G31M-ES2L Memory 3GB DDR2 Graphics Card Asus Nvidia GTX 560Ti 1GB Sound Card On-board Monitor(s) Displays HCL eZeeBee 18.5" LCD Screen Resolution 1366x768 @ 60Hz Keyboard Stock Mouse Stock PSU Corsair CX500 V2 500W Cooling Stock Hard Drives Western Digital 320GB Internet Speed 15-25kBps D/L | 10kBps U/L | Hey Don't laugh System Reserved Partition - Delete problems? All times are GMT -5. The time now is 06:45 PM. | |