IMPLEMENTING MASS STORAGE

INSTALL O.S. ONTO A NEW DRIVE. 

THAT'S HOW YOU PARTITION & FORMAT a new drive

Example: Windows costs money. "ubuntu" on Linux is open source

**PARTITIONING & FORMATTING 

must happen before you use any new mass storage drive!**

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RAID LEVELS / FILE STORAGE:

RAID 0 (striping) = 2 drives sharing bits of data from a big file. 

SPEEDS THINGS UP

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RAID 1 (mirroring) = 2 drives share identical bits 

via mirroring each other on both drives. 

Protects against losing everything. Necessary? It's REDUNDANT. Slows things down

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RAID 5 (striping w/parity) = uses 3 drives. 

First two drives save the old RAID 0 way 

but new 3rd drive saves a weird "math parity." clones files via binary math

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RAID 6 = uses 4 drives. 

First two drives save the old RAID 0 way 

but new drives make "math parity" clones of file (via binary math)

**Two drives can fail and everything will still be saved**

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RAID 10 (striping mirrors) = 4 drives with 2 mirrored pairs

 (2 on one side keep top half and 2 on the other side keep bottom half)

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RAID 0+1 (mirror some stripes) 4 drives. 2 striped.

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[] FILE example

_ ^      _ ^

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Decide or configure "RAID" via hardware & software

Cool companies make "proprietary RAIDS" (sinology) to plug in hundreds of DRIVES and  perform crazy combinations of RAID 0 through RAID 0+1

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HARDWARE RAID

You can tell a motherboard not to treat a cluster of hard drives as AHCI 

(regular individual hard drives) but as a "RAID ARRAY" where they all share load.

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motherboards have their own SYSTEM SETUP 

just to tinker with "RAID ARRAYS"

(Switch from "AHCI mode" to "RAID ARRAY mode" to configure this way. Then reboot)

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<CTRL-R> (on blue screen) to build custom RAID ARRAY of select hardware

doing this makes OS think individual drives are all one big drive

Instead of "HOT SPARE / SWAPPABLE DRIVE"

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"RAID CONTROLLER" is a dedicated EXPANSION CARD

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Troubleshooting MASS STORAGE HARD DRIVES

1. Back stuff up (clouds, thumb drives, etc)

2. Mental re-install? 

Re-trace your mental steps of installing the drive and you might remember what you missed.

3. Triple check

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Types of errors with MASS STORAGE

"RAID NOT DETECTED / RAID NOT FOUND / RAID NOT WORKING"

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"Read/write failure" - the DRIVE might be at end of its lifespan

S.M.A.R.T. = SMART tech is built into all HDs, 

& with the right tools we can find out health of the HD

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"Slow performance" usually caused by not enough RAM

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"Loud clicking" noise in HD. 

TINK TINK sound. Terminal HD death. Replace it, ya dingus

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"Failure to boot" make sure boot order is correct via SYSTEM SETUP

You can also use WIN-RE (windows recovery)

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"DRIVE NOT RECOGNISED" 

maybe a formatting problem. just reformat if nothing important is saved on it

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"O.S. not found" 99% certain something fucked up boot order. 

Check via SYSTEM SETUP

CORRUPTED OS can cause loads of reboots. Like overheating causes reboots. 

"continuous reboots"

COMPTIA EXAM tries to trick you with complicated wording

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"APPEARS TO BE INCORRECT DEVICE" = something fucked up boot order 

Check via SYSTEM SETUP