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[Solved] rawdisk partition not detected by guest
Posted: 7. Apr 2015, 17:17
by digit23
I have an issue where raw disk partition on guest are not properly detected.
detail:
I have a second HD on my Win 7 host that I want to access from WinXP guest. Second HD only have a single partition NTFS formated with data on it
I did try to mount raw disk and raw partition. With both solution, guest XP sucessfully detect new disk but does not detect NTFS and ask to format partiton.
I did also try to "disable" HD on host with same result.
Why partition is not detected. How to access data on disk from VM ?
Code: Select all
C:\Program Files\Oracle\VirtualBox>VBoxManage internalcommands createrawvmdk -filename "x:\XP (32 bit)\internal_hd1_wholedisk.vmdk" -rawdisk \\.\PhysicalDrive1
or
Code: Select all
C:\Program Files\Oracle\VirtualBox>VBoxManage internalcommands createrawvmdk -filename "x:\XP (32 bit)\internal_hd1_part 1.vmdk" -rawdisk \\.\PhysicalDrive1 -partitions 1
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 17:56
by scottgus1
If all you want to do is get at the data from within the guest, why not put the data in a Windows-style shared folder on the host? Then open the host's shared folder in the guest. Far safer for the data on the disk.
Both the manual (Section 9.8.1) and the forum's green guys always say, Raw disk access is for experts only and can easily destroy data. Impression I get is: If one has to ask about it, one shouldn't be using it...
(Not really, of course. Ask away, knowledge is power, learning is good, but not on data you need to keep.)
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 18:15
by digit23
Thanks for the suggestion but the idea is to play around, experiment and do development with tools that access raw data on disk. Both from VM and physically.
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 18:23
by socratis
What's the drive that you want to have raw access to? And what's the "X:\" drive? Are they the same?
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 18:26
by mpack
If the guest is offering to format the drive then it doesn't see an existing partition map, which probably means that you have not provided an image of a complete drive.
Are you sure that the second volume in your PC is a separate drive, and not just a secondary partition on the same drive as the C: volume?
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 18:35
by digit23
Note to green guys who deleted his comment, yes I do understand difference between disk and partition...
socratis wrote:What's the drive that you want to have raw access to? And what's the "X:\" drive? Are they the same?
host have two physical disk. First disk two partitions c: and x:, second disk only one partition d:
x: is where my VM are stored.
drive that i'm trying to get access to is d: or second Physical Disk that has only one partition and NTFS formated.
I did create a raw .vmdk that mirror physical disk. That .vmdk is connected as a second disk to my XP VM and properly detected (right size) as d: drive. But unfortunately there is something wrong where partition structure are not properly detected. Guest does not see NTFS partition and ask to format partion.
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 18:39
by mpack
A comment was deleted but you still felt that a response was needed?
Btw. It would be nice if you were more explicit about error messages or symptoms. E.g. provide a screenshot of what you see.
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 19:35
by digit23
You must be a member for 1 days and have 1 posts before you can post urls or img.
Notice the "Computer Management" capture #4, drive D: filesystem is not detected.
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I did obfuscated to workaround posting rules. [domain] is org
s17.postimg.[domain]/yvooi1rin/capture_1.png
s2.postimg.[domain]/bxomunex5/capture_2.png
s1.postimg.[domain]/kfqtu1qlr/capture_3.png
s3.postimg.[domain]/6ull8959v/capture_4.png
internal_hd1_wholedisk.vmdk
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# Disk DescriptorFile
version=1
CID=010ee754
parentCID=ffffffff
createType="fullDevice"
# Extent description
RW 976773168 FLAT "\\.\PhysicalDrive1" 0
# The disk Data Base
#DDB
ddb.virtualHWVersion = "4"
ddb.adapterType="ide"
ddb.geometry.cylinders="16383"
ddb.geometry.heads="16"
ddb.geometry.sectors="63"
ddb.uuid.image="45d2150a-75f5-40cc-ac6b-fbd4330a4697"
ddb.uuid.parent="00000000-0000-0000-0000-000000000000"
ddb.uuid.modification="7323a65b-c25e-4b4e-b663-a5f62b413922"
ddb.uuid.parentmodification="00000000-0000-0000-0000-000000000000"
ddb.geometry.biosCylinders="1024"
ddb.geometry.biosHeads="255"
ddb.geometry.biosSectors="63"
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 20:42
by socratis
digit23 wrote:You must be a member for 1 days and have 1 posts before you can post urls or img.
True for URLs, but not for images. Check the "Upload attachment" at the bottom of your input.
Now, are you by any chance trying to access the disk from the host and the guest
at the same time? Because that's a clear no-no. Read this for the proper way to do it:
viewtopic.php?f=6&t=38914#p175089
Re: rawdisk partition not detected by guest
Posted: 7. Apr 2015, 21:10
by digit23
I do not have to access disk from guest and host at the same time. To prevent this I did put drive "offline" using windows disk management.
culprit was the "4. ATTRIBUTES DISK CLEAR READONLY", for some reason any of the howto that I read give information about that.
Now it is working.
Thanks for the link
