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Xeb's Misadventures as a Data Recovery Engineer - Updated 4/11/2017 - Page 22

post #211 of 220
Quote:
Originally Posted by looniam View Post

i want a refund - this thread sucks!

Here's double the money you paid..
     
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post #212 of 220
Thread Starter 
Quote:
Originally Posted by parityboy View Post

Quote:
Originally Posted by Lord Xeb View Post

Let's have a little education section for those of you who do not know what a RAID 10 is and how it works.

RAID 10 is essentially 2 RAID 0s in a RAID 1. it is the simplist form of a nested RAID you can get. You get LOTS of speed, some redundancy but not a lot else. If you loose one disk in any RAID 0 it will fail since data is sripped on all disks.
RAID 1 is mirroring. With this it is 2 RAID 0s mirrored. Now, you get full read speed as if you were reading from a 6 drive RAID 0. But you get half the speed when writing.

I'd like to clarify something here. As far as I was aware the notation for nested RAID topologies is expressed left-to-right and in the order in which they are applied. So, a RAID as you describe is actually RAID 01 - a mirror of two RAID 0s. RAID 10 would be a striping of two RAID 1s.

I also need to clarify something as well. Not ALL RAID controllers go left to right. This one went right to left. Some kind of weird proprietary strangness that HP does.
 
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post #213 of 220
Quote:
Originally Posted by Lord Xeb View Post

I also need to clarify something as well. Not ALL RAID controllers go left to right. This one went right to left. Some kind of weird proprietary strangness that HP does.

Thank you for that, I've learned something new. biggrin.gifthumb.gif
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post #214 of 220
Thread Starter 
Not a problem. MOST raids are left to right... But then you also have to deal with backward and forward synchronous and asynchronous with RAID 5 and 6... fun times.
 
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post #215 of 220
Thread Starter 
Case 8

Oh boy oh boy. Xebby has a new toy!

We recently got this wonderfully awesome super cool new thing from Ace Labs. Anyone guess what it is? PC3000 SAS/SCSI w/ RAID recovery and extraction. Oh boy! We have been having some trouble as of late with getting data from SCSI and SAS drives. Well, this new fancy tool lets us get the job done. Sometimes tempermental when you have a bad drive but isn't everything?

The first case to use this on? 2.5" 73GB 15K Seagate SAS drive with stuck heads. Yep... Stuck heads on a tiny little platters.



Okay dark alter ego. You can go back in your cage now.

So, how exactly does one unstick heads? There are a few ways. One involves tools (very expensive tools mind you) and the other involves using what you got. Well, you don't have tools for EVERY drive made so we got to do with what we have. What is the trick?

Bit hard to explain but here it goes:

You take the lid off the drive but leave the magnet and stops in place. Place your thumb right on top of the bearing of the heads and apply pressure. Then, you turn your thumb while maintaining some pressure counter clockwise. Next, you grab a screw driver and you bang on the top of the drive to get the heads to "jump" off the platters. Seems barbaric, unprofessional and scary but I trust you it works. The trick is to keep the head assembly steady with even pressure and apply even torque throughout the process. So far, my head recovery rate is approx 90% using this method. It takes time, practice and a little luck but works. The original heads still work and most of the time leaves no marks on the platters.

I perform the described method above, reassemble the drive and test it. What do you know, the damn thing still works. It starts making some strange sounds but nice thing with these kinds of drives is there ability to recalibrate. After about 10 minutes of it making various clicking, seeking and recal sounds it gets ready and I can access the drive via our new tool. Open the utility, create a task and bam, it images well but requires constant recalibration. With some tweaking it moves along at a nice steady clip. The only issue is toward the end of the drive there are bad blocks. No big deal. I checked over that area of the drive and there was no data except for the termination of the EFI table.

Amateurs need not apply here. A pro with the right tools, techniques and knowhow can and will find a way.

The cazy thing is that this job came in same day and left same day. Thankfully it was a tiny drive. Otherwise this could have gone on for a while... Maybe "gasp" required a head exchange. *shivers thinking of doing one on this drive*.

Now, dark alter ego, what do you have to say?


Edited by Lord Xeb - 4/11/17 at 5:58pm
 
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post #217 of 220
Quote:
Originally Posted by Lord Xeb View Post

Oh boy oh boy. Xebby has a new toy!
Oh boy! We have been having some trouble as of late with getting data from SCSI and SAS drives.

Is this simply because your existing PC3K units don't have SCSI or SAS interfaces, or something else?
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post #218 of 220
Thread Starter 
Quote:
Originally Posted by parityboy View Post

Quote:
Originally Posted by Lord Xeb View Post

Oh boy oh boy. Xebby has a new toy!
Oh boy! We have been having some trouble as of late with getting data from SCSI and SAS drives.

Is this simply because your existing PC3K units don't have SCSI or SAS interfaces, or something else?

There is that but it is also because SAS and SCSI drives are a bit different from normal SATA drives in how they work in terms of their firmware. There is a whole other way the PC3K initilizes them and communicates it is... interesting. Completely separate tool for completely separate drive technologies.

Plus, SAS and SCSI drives are not compatible with SATA interfaces. There are also different families of drives that are enterprise class and have their own separate utilities from SATA.
Edited by Lord Xeb - 4/11/17 at 5:54pm
 
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post #219 of 220
@Xeb

So if a customer came in with an MFM or RLL drive, what would you do? tongue.gif
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post #220 of 220
Thread Starter 
I may still be able to obtain data. Those drives are pretty hardy.
 
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C2D 2,26GHz under volted @ .978v 8GB  Crucial M4 64GB SSD 500GB Scorpio Black 
OSMonitorKeyboardMouse
OS X 10.0 1280x800 Built-in Trackpad 
Audio
Built-in 
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Overclock.net › Forums › Components › Hard Drives & Storage › Xeb's Misadventures as a Data Recovery Engineer - Updated 4/11/2017