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Xeb's Misadventures as a Data Recovery Engineer - Updated 4/11/2017 - Page 10

post #91 of 220
Thread Starter 
They place data based on what the file system tells it to do not on what the drive wants to do. If the file system has some free space it can rather random. For larger files like videos this is usually contiguous through a set of LBAs. The way the drive bobs and weaves as it puts data down is predictable. What the file system decides... not so much.

Remember a hard drive has it own rules it plays by but a file system uses blocks, not sectors. Blocks are usually chunked together (depending on sector size, file system type, block size, etc). Usually this is in 256 sector chunks. Drives usually have 256-4096k sector size. Think of it as an abstraction layer. So, if a block is free in the middle of the drive, it will put it there but that block could be between two surfaces. Hell, a single video could be written across multiple surfaces...

Seagate drives generally write like this:

0123210.

WD"
0123
0123

Hitachi is similar to WD
Toshiba as well

Samsung writes in HUGE chunks. You could have a 1TB drive that is abotu 976 million sectors. Each chunk could be 250 million sectors. But it still jumps 01230123
Edited by Lord Xeb - 12/2/16 at 3:39pm
 
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post #92 of 220
Interesting stories! Always a bit of an eye-opener eek.gif to find out just how badly hard drives can do themselves in when you least expect them to.
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post #93 of 220
Thread Starter 
Indeed
 
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post #94 of 220
As someone who does simple deleted file recovery for clients, how often do you get this kind of work, or is that usually something that stays to us pleb technicians?.
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post #95 of 220
Thread Starter 
I would say about 10-15% of the time.
 
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post #96 of 220
I'm not too attached to my data, but I was asked to back up some images for a friend - external HDD, two internal HDD, flash drive, and laptop. Original on her flash drive too. It needs to be on multiple sources across different detached devices.
Of course, this is no doubt common logic in a thread like this, but it never hurts to be said.

Also glad we are still getting stories Xeb! Thank you!
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post #97 of 220
Thread Starter 
Thank you kind sir. I hope to have another one up later today or tomorrow. Got an evaluation from hell with a WD drive.

Sneak peak:
Firmware, Mechanical, logical (bad sectors) and encrypted (hardware).
 
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post #98 of 220
BTW, is there some horrible thing with recovering data from certain Seagate drives? I've been using ST1000DM003 and ST3000DM001 (you worked on one in your stories). Other than that, I've got a Seagate GoFlex that 3 different softwares said was in perfect health still. It's like 6 years old now. (Before you ask, I don't use it for anything important)
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post #100 of 220
Thread Starter 
Quote:
Originally Posted by AcEsSalvation View Post

BTW, is there some horrible thing with recovering data from certain Seagate drives? I've been using ST1000DM003 and ST3000DM001 (you worked on one in your stories). Other than that, I've got a Seagate GoFlex that 3 different softwares said was in perfect health still. It's like 6 years old now. (Before you ask, I don't use it for anything important)

Not all Seagate drives are like that but most of them are a pain regardless.

The ones you generally want to look out for:

DM series (newer ones are okay)
FreePlay series (Those big fat 1TB external drives labeled as GoFlex)

Any other Seagate drive are like most. They are a pain in the butt when they hit bad sectors. Normally, lets take a WD drive, you can just do a soft reset to go get the drive to continue reading. Hitachi you can just re-calibrate. Same for Toshiba drives. Seagates? Nah, those are a real pain.
  • Drive hits a bad block it must be power cycled or it will not read
  • Gets some nasty firmware issues when there are a lot of bad sectors (and go beyond the allocated sectors for reallocation) <--- Real pain in the butt
  • Sometimes difficult to gain terminal access. Important when trying to get critical values to find compatible drives with compatible heads. <--- Sometimes requires shorting the read head channel on PCB.... Which is all about timing and you got about a second to get it right.
  • Even with a compatible donor with compatible pre-amp you can still have a head that is way off the mark for resistances further making finding heads a pain.
  • They destabilize easy.

Each manufacturer has its own quirks but Seagate you cannot do a lot of fancy stuff with them. Generally, if it works it works. If it doesn't you got your work cut out for you.
 
Gsvlip Dudyrm
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Oda'maksv
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Gsvlip Dudyrm
(15 items)
 
Oda'maksv
(9 items)
 
CPUMotherboardGraphicsRAM
3770k @ 4.5 1.312 load Zotac Z77 ITX Wifi GTX 1070 Gaming 2126/2249 w/ Hybrid cooler TridentX 16GB 2400MHz 
Hard DriveHard DriveCoolingCooling
Samsung 850 Pro 1TB Seagate 2TB H105 EVGA Hybrid GPU cooler 
OSMonitorKeyboardPower
Windows 10 Asus MG279Q - 24" 144Hz 1080p Filco Majestic II w/ Cherry Reds Seasonic X 760W 
CaseMouseMouse PadAudio
Bitfelix Prodigy Logitech G400 Razer Goliath AKG A701 
AudioAudio
JDS Labs Objective 2 JDS Labs ODAC 
CPUMotherboardGraphicsRAM
Core i5 750 3.99 (190x21) 1.376v Load ASUS P7P55d-E Pro GTX 670 FTW <- Poor overclocker :( 8GB (4x2GB) G.Skill DDR3 1600 
Hard DriveHard DriveOptical DriveOS
Samsung 830 Evo 128GB 2x 2TB  Some DVD drive OSX 10.10.4 
MonitorPowerCaseMouse
Asus 1080P Crap TX 750 HAF 922 G400s 
Mouse PadOther
Apple Keyboard Xbox One controler 
CPURAMHard DriveHard Drive
C2D 2,26GHz under volted @ .978v 8GB  Crucial M4 64GB SSD 500GB Scorpio Black 
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OS X 10.0 1280x800 Built-in Trackpad 
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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