## Full Disk Encryption with Time Machine Backup

I don’t know the appropriate setup to encrypt whole disk drive using FileVault 2 and Automatically backup it without issues. Currently, I’m using a 2nd-gen Intel i7 MBP running macOS High Sierra 10.13.6 (17G5019), One Internal Crucial SSD, APFS volume, and using Time Machine for Backup on a G-technology External Drive, Mac OS Extended (Journaled).

/dev/disk0 (internal, physical): #:                       TYPE NAME                    SIZE       IDENTIFIER 0:      GUID_partition_scheme                        *500.1 GB   disk0 1:                        EFI EFI                     209.7 MB   disk0s1 2:                 Apple_APFS Container disk1         499.9 GB   disk0s2  /dev/disk1 (synthesized): #:                       TYPE NAME                    SIZE       IDENTIFIER 0:      APFS Container Scheme -                      +499.9 GB   disk1                              Physical Store disk0s2 1:                APFS Volume Macintosh HD            456.0 GB   disk1s1 2:                APFS Volume Preboot                 20.4 MB    disk1s2 3:                APFS Volume Recovery                512.0 MB   disk1s3 4:                APFS Volume VM                      10.7 GB    disk1s4  /dev/disk2 (external, physical): #:                       TYPE NAME                    SIZE       IDENTIFIER 0:      GUID_partition_scheme                        *4.0 TB     disk2 1:                        EFI EFI                     209.7 MB   disk2s1 2:                  Apple_HFS G-DRIVE USB             4.0 TB     disk2s2 3:       Microsoft Basic Data G-UTILITIES             4.1 GB     disk2s3 

## On dual-boot macOS/Ubuntu Mojave install failed with “This disk cannot be used to startup your computer.”

My box is mid 2012 MacBook Pro, 1 TB HD, Sierra 10.12.6. It has dual-booted with Ubuntu using rEFInd until the High Sierra installation failed, after which I only used Ubuntu. After uninstalling rEFInd I’m attempting to upgrade the macOS side to Mojave and get the error above. I’ve already run First Aid on the Macintosh HD. Here’s the partitioning:

# diskutil list disk0 /dev/disk0 (internal, physical):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:      GUID_partition_scheme                        *1.0 TB     disk0    1:                        EFI EFI                     209.7 MB   disk0s1    2:          Apple_CoreStorage Macintosh HD            500.4 GB   disk0s2    3:                  Apple_HFS Recovery HD             650.0 MB   disk0s3    4:           Linux Filesystem                         498.8 GB   disk0s4 # gpt -r show disk0 gpt show: disk0: Suspicious MBR at sector 0        start        size  index  contents            0           1         MBR            1           1         Pri GPT header            2          32         Pri GPT table           34           6                    40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B       409640   977270656      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC    977680296     1269536      3  GPT part - 48465300-0000-11AA-AA11-00306543ECAC    978949832   974313152      4  GPT part - 0FC63DAF-8483-4772-8E79-3D69D8477DE4   1953262984      262151            1953525135          32         Sec GPT table   1953525167           1         Sec GPT header 

Is there a way to install Mojave without reformatting?

## Does Cloudready Chrome OS Home Edition have full disk encryption?

I was wondering if Cloudready Chrome OS Home Edition (basically ChromeOS) have full disk encryption or maybe only user space is encrypted? It is a little fuzzy to me.

## Mojave: warning using disk utility: invalid bsd_flags

IMac: Using the disk utility, I get a warning: inode_val: object (oid 0x176461): invalid bsd_flags (0x10) strong text

I have tried to erase HD and reinstall Mojave twice. In vain. Tried to restore from Time Machine. Message: Not possible. Disk utility freezes. Very slow Mac.

## Disk Utility First Aid in recovery failed to restore volume to original state

I was trying to repair permissions today on my Mac so I ran the Disk Utility’s First Aid on my drive and it said that there was an Invalid Index Key and that my disk was corrupt and I needed to run the first aid in Recovery mode.

So I opened in recovery mode and ran the first aid and it tried to fix the B-Tree of the catalog file, however there wasn’t enough disk space to do this.

Then it tried to restore the disk to it’s original state on mount but it couldn’t do this either, I’m guessing because of lack of disk space.

Sorry I didn’t get any screenshots or anything but that is basically what happened.

Now the disk is greyed out in disk utility and I can’t reinstall mac os x because I would need to erase all of the data on the drive and I don’t want to lose the files I have on it.

So what I thought I could try is delete my BOOTCAMP partition, which is about 100GB, and then merge the free space into the problem partition so that I can run fsck -fy in single user mode to try to repair the volume which now will have enough space to complete the operation.

However the option to delete the BOOTCAMP partition is disabled in Disk Utility. So I did some research and found another post on AskDifferent that explained how to delete a partition from terminal (in recovery mode) by first unmounting the physical disk using diskutil unmountDisk /dev/disk0 and then deleting the partition using gpt remove.

Now I tried to unmount the disk using that command and even with the force wildcard but it said:

Forced unmount of disk0 failed: at least one volume could not be unmounted Unmount was dissented by PID 0 

The volume with PID 0 from the list provided by diskutil list is called GUID_partition_scheme.

This is as far as I got through searching for solutions online. I need help deleting the BOOTCAMP partition and merging with the greyed out Mac HD partition so that I can run fsck to hopefully restore my mac os to working order. At the moment I can’t boot into the OS and can only boot into recovery mode or single user mode. Hopefully I will atleast be able to retrieve files from the HD if all else fails.

## Why can’t I change the permission of my CD disk

I can’t format my CD and I can’t change its permissions to allow me to read and write it. What can I do to change its permissions?

## Unable to use disk removed from Synology NAS with a Mac – wrong partition size showing

I have 2 x 3TB disks I’ve removed from a Synology NAS. When I try to mount these disks on OS X, they show as only having a single 800GB partition.

I’ve tried erasing in the Disk Util app, but it only finds and creates a new partition for the 800GB.

Repartitioning, erasing, repairing, all only see the disk as 800GB.

Any idea how to get these back to 3TB each? Both disks behave identically, and are WD RED disks WD30EFRX

disktutil – List…

/dev/disk3 (external, physical):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:      GUID_partition_scheme                        *801.6 GB   disk3    1:                        EFI EFI                     209.7 MB   disk3s1    2:                  Apple_HFS Untitled                801.2 GB   disk3s2 

And the info…

DT:~ david\$   diskutil info /dev/disk3    Device Identifier:         disk3    Device Node:               /dev/disk3    Whole:                     Yes    Part of Whole:             disk3    Device / Media Name:       EFRX-68EUZN0     Volume Name:               Not applicable (no file system)    Mounted:                   Not applicable (no file system)    File System:               None     Content (IOContent):       GUID_partition_scheme    OS Can Be Installed:       No    Media Type:                Generic    Protocol:                  USB    SMART Status:              Not Supported     Disk Size:                 801.6 GB (801569726464 Bytes) (exactly 1565565872 512-Byte-Units)    Device Block Size:         512 Bytes     Read-Only Media:           No    Read-Only Volume:          Not applicable (no file system)     Device Location:           External    Removable Media:           Fixed     Virtual:                   No 

What avenue to wipe this drive and set it up for new filesystem to be installed exist?

## Bypassing the Failed Disk “Read Only” Mode

On macOS, if a disk is failing, you will sometimes get the message below. The OS will put the disk into read-only mode. You can get your files off of it but you can’t write to it.

My question is, is there any way to bypass this, and put the disk BACK into normal read-write mode?

## В чём причина сообщеня did not write partition table to disk?

Пытаюсь поставить ArchLinux при разметки диска прога fcdisk пишет

did not write partition table to disk

и соответственно ни чего не размечает.

Bios обычный, пробовал на разных жёстких дисках на них всё так же хотя другие варианты linux без проблем ставятся.

## Action of the symmetric group on connected sums of manifolds (minus a disk)

Let $$M$$ be a connected compact topological $$n$$-dimensional manifold without a boundary and with a CW-structure $$M= \bigcup M^i$$. We have that $$(\#^g M)\smallsetminus D^n \simeq \bigvee_{i=1}^gM^{n-1}$$ The symmetric group $$S_g$$ acts on $$\bigvee_{i=1}^gM^{n-1}$$ by permuting the summands. In particular every element $$\sigma\in S_g$$ induces an automorphism $$\sigma_*\colon \bigvee_{i=1}^gM^{n-1}\to\bigvee_{i=1}^gM^{n-1}$$, which extends (non-uniquely) to a homotopy self-equivalence of $$(\#^g M)\smallsetminus D^n$$.

My question: Could we extend $$\sigma_*$$ to be a homotopy self-equivalence of $$(\#^g M)\smallsetminus D^n$$ that preserves the boundary pointwise?