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Request of urgent help....

Started byfrantal@libero.it
First post2022-01-12 19:10 +0100
Last post2022-01-13 23:10 +0100
Articles 4 — 3 participants

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  Request of urgent help.... frantal@libero.it - 2022-01-12 19:10 +0100
    Re: Request of urgent help.... David Christensen <dpchrist@holgerdanske.com> - 2022-01-13 03:20 +0100
      Re: Request of urgent help.... frantal@libero.it - 2022-01-13 09:10 +0100
        Re: Request of urgent help.... Tim Woodall <debianuser@woodall.me.uk> - 2022-01-13 23:10 +0100

#243928 — Request of urgent help....

Fromfrantal@libero.it
Date2022-01-12 19:10 +0100
SubjectRequest of urgent help....
Message-ID<DEQem-3ZL-5@gated-at.bofh.it>

[Multipart message — attachments visible in raw view] — view raw

Hi. I inadvertently deleted the Mac and EFI partitions of an HD inserted on a Macbook Pro (2009). Fortunately I have the Linux one (with Debian XFCE) that I am writing from. I tried to recover with Gparted (by installing gpart), but after more than an hour I stopped having no recovery signal. Then I installed test disk and this is the screen.
<TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <grenier@cgsecurity.org>
https://www.cgsecurity.org

Disk /dev/sda - 480 GB / 447 GiB - CHS 58369 255 63
Partition Start End Size in sectors
P EFI System 40 409639 409600 [EFI System Partition]
>P Mac HFS 409640 700519039 700109400
P Linux filesys. data 700520448 759113727 58593280
P Linux Swap 759113728 761114607 2000880
P Linux filesys. data 761114624 937701375 176586752

Structure: Ok. Use Up/Down Arrow keys to select partition.
Use Left/Right Arrow keys to CHANGE partition characteristics:
P=Primary D=Deleted
Keys A: add partition, L: load backup, T: change type,
Enter: to continue
HFS+ blocksize=4096 + Backup, 358 GB / 333 GiB>

All partitions appear highlighted in green.
What can I do to reset Mac OS?
I don't dare shut down because I'm afraid it won't reboot anymore having wiped the EFI partition as well.
How can I do without loosing the Mac data? Thanks in advance
Francesco

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#243940

FromDavid Christensen <dpchrist@holgerdanske.com>
Date2022-01-13 03:20 +0100
Message-ID<DEXSx-VH-1@gated-at.bofh.it>
In reply to#243928
On 1/12/22 10:00 AM, frantal@libero.it wrote:
> Hi. I inadvertently deleted the Mac and EFI partitions of an HD inserted on a Macbook Pro (2009). Fortunately I have the Linux one (with Debian XFCE) that I am writing from. I tried to recover with Gparted (by installing gpart), but after more than an hour I stopped having no recovery signal. Then I installed test disk and this is the screen.
> <TestDisk 7.1, Data Recovery Utility, July 2019
> Christophe GRENIER <grenier@cgsecurity.org>
> https://www.cgsecurity.org
> 
> Disk /dev/sda - 480 GB / 447 GiB - CHS 58369 255 63
> Partition Start End Size in sectors
> P EFI System 40 409639 409600 [EFI System Partition]
>> P Mac HFS 409640 700519039 700109400
> P Linux filesys. data 700520448 759113727 58593280
> P Linux Swap 759113728 761114607 2000880
> P Linux filesys. data 761114624 937701375 176586752
> 
> Structure: Ok. Use Up/Down Arrow keys to select partition.
> Use Left/Right Arrow keys to CHANGE partition characteristics:
> P=Primary D=Deleted
> Keys A: add partition, L: load backup, T: change type,
> Enter: to continue
> HFS+ blocksize=4096 + Backup, 358 GB / 333 GiB>
> 
> All partitions appear highlighted in green.
> What can I do to reset Mac OS?
> I don't dare shut down because I'm afraid it won't reboot anymore having wiped the EFI partition as well.
> How can I do without loosing the Mac data? Thanks in advance
> Francesco


Please run the following commands and reply with the complete console 
session -- prompts displayed, commands entered, and output displayed:

# cat /etc/debian_version ; uname -a

# lsblk

# fdisk -l

# which parted


David

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#243954

Fromfrantal@libero.it
Date2022-01-13 09:10 +0100
Message-ID<DF3lf-4Nx-1@gated-at.bofh.it>
In reply to#243940
> Il 13/01/2022 03:08 David Christensen <dpchrist@holgerdanske.com> ha scritto:
> 
>  
> On 1/12/22 10:00 AM, frantal@libero.it wrote:
> > Hi. I inadvertently deleted the Mac and EFI partitions of an HD inserted on a Macbook Pro (2009). Fortunately I have the Linux one (with Debian XFCE) that I am writing from. I tried to recover with Gparted (by installing gpart), but after more than an hour I stopped having no recovery signal. Then I installed test disk and this is the screen.
> > <TestDisk 7.1, Data Recovery Utility, July 2019
> > Christophe GRENIER <grenier@cgsecurity.org>
> > https://www.cgsecurity.org
> > 
> > Disk /dev/sda - 480 GB / 447 GiB - CHS 58369 255 63
> > Partition Start End Size in sectors
> > P EFI System 40 409639 409600 [EFI System Partition]
> >> P Mac HFS 409640 700519039 700109400
> > P Linux filesys. data 700520448 759113727 58593280
> > P Linux Swap 759113728 761114607 2000880
> > P Linux filesys. data 761114624 937701375 176586752
> > 
> > Structure: Ok. Use Up/Down Arrow keys to select partition.
> > Use Left/Right Arrow keys to CHANGE partition characteristics:
> > P=Primary D=Deleted
> > Keys A: add partition, L: load backup, T: change type,
> > Enter: to continue
> > HFS+ blocksize=4096 + Backup, 358 GB / 333 GiB>
> > 
> > All partitions appear highlighted in green.
> > What can I do to reset Mac OS?
> > I don't dare shut down because I'm afraid it won't reboot anymore having wiped the EFI partition as well.
> > How can I do without loosing the Mac data? Thanks in advance
> > Francesco
> 
> 
> Please run the following commands and reply with the complete console 
> session -- prompts displayed, commands entered, and output displayed:
> 
> # cat /etc/debian_version ; uname -a
> 11.2
Linux debian 5.10.0-10-amd64 #1 SMP Debian 5.10.84-1 (2021-12-08) x86_64 GNU/Linux
> # lsblk
> NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 447,1G  0 disk 
├─sda3   8:3    0  27,9G  0 part /
├─sda4   8:4    0   977M  0 part [SWAP]
└─sda5   8:5    0  84,2G  0 part /home
sdc      8:32   1  57,8G  0 disk 
└─sdc1   8:33   1  57,7G  0 part /media/frantal/KINGSTON
sr0     11:0    1  1024M  0 rom 
> # fdisk -l
> Disk /dev/sda: 447,13 GiB, 480103981056 bytes, 937703088 sectors
Disk model: CT480BX500SSD1  
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 20F7D036-E7D4-4247-9944-2190A2A933AE

Device         Start       End   Sectors  Size Type
/dev/sda3  700520448 759113727  58593280 27,9G Linux filesystem
/dev/sda4  759113728 761114623   2000896  977M Linux swap
/dev/sda5  761114624 937701375 176586752 84,2G Linux filesystem


Disk /dev/sdc: 57,8 GiB, 62058921984 bytes, 121208832 sectors
Disk model: DataTraveler 3.0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x2e247b39

Device     Boot  Start       End   Sectors  Size Id Type
/dev/sdc1  *    257280 121208831 120951552 57,7G  c W95 FAT32 (LBA)
> # which parted
> /usr/sbin/parted
> 
> David
gpart version:
gpart  v0.2.3-dev (c) 1999-2001 Michail Brzitwa <michail@brzitwa.de>
Regards 
Francesco

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#243971

FromTim Woodall <debianuser@woodall.me.uk>
Date2022-01-13 23:10 +0100
Message-ID<DFgs9-5QC-3@gated-at.bofh.it>
In reply to#243954
Do you have an external disk you can copy sda to and experiment on?

>>> Disk /dev/sda - 480 GB / 447 GiB - CHS 58369 255 63
>>> Partition Start End Size in sectors
>>> P EFI System 40 409639 409600 [EFI System Partition]
>>>> P Mac HFS 409640 700519039 700109400
>>> P Linux filesys. data 700520448 759113727 58593280
>>> P Linux Swap 759113728 761114607 2000880
>>> P Linux filesys. data 761114624 937701375 176586752
>>>

>> # fdisk -l
>> Disk /dev/sda: 447,13 GiB, 480103981056 bytes, 937703088 sectors
> Disk model: CT480BX500SSD1
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: gpt
> Disk identifier: 20F7D036-E7D4-4247-9944-2190A2A933AE
>
> Device         Start       End   Sectors  Size Type
> /dev/sda3  700520448 759113727  58593280 27,9G Linux filesystem
> /dev/sda4  759113728 761114623   2000896  977M Linux swap
> /dev/sda5  761114624 937701375 176586752 84,2G Linux filesystem
>

Looks like sda1 and sda2 are missing from the partition table.

If it's just that then putting that back but changing nothing else is
all that is needed.

I'd use fdisk to do it, but other tools might be easier/less error
prone.


But making a disk level backup first is strongly recommended! It's
really easy to make things worse.

It's not obvious to me why there is a gap between the end of the HFS
partition and the start of sda3. That might be expected or might mean
the sector numbers aren't quite right...

Tim.

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