Where are my crash dumps?
Windows 10 puts crash dumps in different locations as compared to Windows XP

Kernel Dumps are here:
%SystemRoot%\LiveKernelReports

Userland Dumps are here:
%ProgramData%\Microsoft\Windows\WER\ReportArchive

One directory up in WER you will see:
Report Archive
Report Queue
Temp

One could assume that Windows Error Reporting (WER) will put initial dump files and other telemetry in the Queue and once they are transmitted to the Microsoft team moved to Archive.  Perhaps you don't want your crashes reported.  How does one turn off WER but still maintain the ability to see what has crashed?

Centos mdadm -- how to replace an already failed drive.   There is a TON of information on the web about mdadm.  My problem was that the config file didn't exist.  After I created that everything else jived with what I was reading. 

/dev/sdb failed

1. find out UUID and details of the array

Use --examine to look at an existing disk

mdadm --examine -v /dev/sde

output:

 Magic : a92b4efc

        Version : 1.2

    Feature Map : 0x0

     Array UUID : a94ed4cc:acd0f975:28f03379:fe085d38

There is the Array UUID

I didn't have a mdadm.conf file, so I had to create one (it's apparently optional and I didn't create one when I first build the raid).

mkdir /etc/mdadm/mdadm.conf (this is where centos keeps it I believe)
Add these lines and make sure all others are commented out

DEVICE /dev/sdb /dev/sdc /dev/sdd /dev/sde

ARRAY /dev/md0 UUID=a94ed4cc:acd0f975:28f03379:fe085d38

My array has 4 drives as you can see

Start the array ( you might have to stop it first)

mdadm --assemble /dev/md0 --scan --force

Re-start the array (force it) and add the drive that you've replaced

mdadm: Marking array /dev/md0 as 'clean'

mdadm: /dev/md0 has been started with 3 drives (out of 4).

[root@localhost ~]# mdadm --manage /dev/md0 --add /dev/sdb

mdadm: added /dev/sdb

Bingo!

mdadm --detail /dev/md0

/dev/md0:

        Version : 1.2

  Creation Time : Mon Feb 29 01:02:46 2016

     Raid Level : raid5

     Array Size : 2929893888 (2794.16 GiB 3000.21 GB)

  Used Dev Size : 976631296 (931.39 GiB 1000.07 GB)

   Raid Devices : 4

  Total Devices : 4

    Persistence : Superblock is persistent

    Update Time : Tue Mar 13 07:25:23 2018

          State : clean, degraded, recovering 

 Active Devices : 3

Working Devices : 4

 Failed Devices : 0

  Spare Devices : 1

         Layout : left-symmetric

     Chunk Size : 512K

 Rebuild Status : 0% complete

           Name : user-S5000PSL-2:my-raid

           UUID : a94ed4cc:acd0f975:28f03379:fe085d38

         Events : 3569

    Number   Major   Minor   RaidDevice State

       5       8       16        0      spare rebuilding   /dev/sdb

       1       8       32        1      active sync   /dev/sdc

       2       8       48        2      active sync   /dev/sdd

       4       8       64        3      active sync   /dev/sde

Where are my Photos!

Where are original photos kept in Mac OSX Photo Library:

They are kept under the Pictures directory in your user files.  From there navigate to a location  /Users/$USER/Pictures/Photos Library.photoslibrary/Masters.

You'll see directories named with the import date e.g.

/Users/$USER/Pictures/Photos Library.photoslibrary/Masters/2018/02/18/20180218-011927