BitLocker - why 1500 MB partition?

[Guest Anders Lund]

Hi

 

Running Windows Vista x64 SP2 beta on a HP notebook.

 

I use BitLocker and have no problems with it. But I have yet to

discover the reason for the BitLocker drive have to bee (at least?)

1500 MB in size. Looking at the properties for the drive, I can see

that only about 50 MB is in use.

 

Reasons I have thought of could be:

- Windows Vista have to have at least 1500 MB on the boot partition

(for some reason).

- Windows need to have room to save some dump files to a non-encrypted

drive.

- In case of the need of Windows Repair, it must have room to save

files on a non-encrypted drive.

 

These are all unconfirmed theories. So I ask you - What is up with the

1500 MB partition?

 

/Anders

[Guest Darrell Gorter[MSFT]]

Hello Anders,

It's required to allow for backup of the volume.

If the volume size is too small backup cannot take place on that volume,

this would prevent those volumes from being backed up or restored

Thanks,

Darrell Gorter[MSFT]

 

This posting is provided "AS IS" with no warranties, and confers no rights

--------------------

| >From: Anders Lund <anderslund@gmail.com>

| >Newsgroups: microsoft.public.windows.vista.security

| >Subject: BitLocker - why 1500 MB partition?

| >Date: Wed, 10 Dec 2008 00:49:02 -0800 (PST)

| >Organization: http://groups.google.com

| >Lines: 21

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TK2MSFTNGHUB02.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSFTFEEDS01.phx.gbl!msrtrans!

msrn-in!newshub.sdsu.edu!postnews.google.com!a26g2000prf.googlegroups.com!no

t-for-mail

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microsoft.public.windows.vista.security:19983

| >X-Tomcat-NG: microsoft.public.windows.vista.security

| >

| >Hi

| >

| >Running Windows Vista x64 SP2 beta on a HP notebook.

| >

| >I use BitLocker and have no problems with it. But I have yet to

| >discover the reason for the BitLocker drive have to bee (at least?)

| >1500 MB in size. Looking at the properties for the drive, I can see

| >that only about 50 MB is in use.

| >

| >Reasons I have thought of could be:

| >- Windows Vista have to have at least 1500 MB on the boot partition

| >(for some reason).

| >- Windows need to have room to save some dump files to a non-encrypted

| >drive.

| >- In case of the need of Windows Repair, it must have room to save

| >files on a non-encrypted drive.

| >

| >These are all unconfirmed theories. So I ask you - What is up with the

| >1500 MB partition?

| >

| >/Anders

| >

[Guest Paul Adare]

On Thu, 11 Dec 2008 03:32:20 GMT, "Darrell Gorter[MSFT]" wrote:

<span style="color:blue">

> Hello Anders,

> It's required to allow for backup of the volume.

> If the volume size is too small backup cannot take place on that volume,

> this would prevent those volumes from being backed up or restored</span>

 

That's not the original reason given. Nor does that explain why in Win7 the

partition is only 200 MB. The original reason given was that certain

servicing operations, such as patching Office required a certain amount of

free space on the system volume.

 

--

Paul Adare

MVP - Identity Lifecycle Manager

http://www.identit.ca

[Guest Darrell Gorter[MSFT]]

Hello Paul,

Not sure what the reason you heard was.

There may be other requirements as well.

There was a limit in VSS, so Complete PC Backup would not backup the volume

unless the size was at least one gig.

See this technet article

http://technet.microsoft.com/en-us/library/bb808827.aspx

Also, the volume must be at least 1 gigabyte (GB) for DPM to protect it.

DPM uses the Volume Shadow Copy Service (VSS) to create a snapshot of the

protected data, and VSS will create a snapshot only if the volume size is

greater than or equal to 1 GB.

 

There was also an requirement for the volume to have at least 400 meg free

in order to be able to upgrade from edition to edition (Home to Ultimate)

or from a downlevel OS.

Certain setup files as well as the WinPE (boot.wim) file were copied to

that volume to loaded on the subsequent reboot.

 

 

 

Thanks,

Darrell Gorter[MSFT]

 

This posting is provided "AS IS" with no warranties, and confers no rights

--------------------

| >From: Paul Adare <pkadare@gmail.com>

| >Subject: Re: BitLocker - why 1500 MB partition?

| >User-Agent: 40tude_Dialog/2.0.15.1

| >MIME-Version: 1.0

| >Content-Type: text/plain; charset="us-ascii"

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| >Organization: IdentIT In.c

| >References:

<50367e0c-0be8-4c3d-998f-db8eca9416b7@a26g2000prf.googlegroups.com>

<6syEXE0WJHA.2208@TK2MSFTNGHUB02.phx.gbl>

| >Date: Wed, 10 Dec 2008 21:52:03 -0600

| >Message-ID: <hei3vxtjbhxv$.16w1gppdt23a.dlg@40tude.net>

| >Newsgroups: microsoft.public.windows.vista.security

| >NNTP-Posting-Host: 12.41.223.154

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| >Path: TK2MSFTNGHUB02.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSFTNGP04.phx.gbl

| >Xref: TK2MSFTNGHUB02.phx.gbl

microsoft.public.windows.vista.security:20014

| >X-Tomcat-NG: microsoft.public.windows.vista.security

| >

| >On Thu, 11 Dec 2008 03:32:20 GMT, "Darrell Gorter[MSFT]" wrote:

| >

| >> Hello Anders,

| >> It's required to allow for backup of the volume.

| >> If the volume size is too small backup cannot take place on that

volume,

| >> this would prevent those volumes from being backed up or restored

| >

| >That's not the original reason given. Nor does that explain why in Win7

the

| >partition is only 200 MB. The original reason given was that certain

| >servicing operations, such as patching Office required a certain amount

of

| >free space on the system volume.

| >

| >--

| >Paul Adare

| >MVP - Identity Lifecycle Manager

| >http://www.identit.ca

| >

[Guest Anders Lund]

On Dec 12, 4:07 am, Darre...@online.microsoft.com ("Darrell Gorter

[MSFT]") wrote:<span style="color:blue">

> Hello Paul,</span>

 

Thank you both for your input. :-)

 

/Anders