Hard drives
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== Thrash the drive == |
== Thrash the drive == |
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| − | Drive thrashing should involve the looping creation (write) and md5sum (read) and then deletion of files of random sizes. Data from /dev/urandom. |
+ | Drive thrashing should involve the looping creation (write) and md5sum (read) and then deletion of files of random sizes. Data from /dev/zero |
| − | * Is this efficient really? |
+ | * Is this efficient really? Do we need random filesizes? How about a range of constant sizes? Or just constant sizes? |
| + | == Destructive testing == |
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| + | Test a drive and then stress it till the tests break. Keep going till the drive breaks... |
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| − | == [[Magnets]] == |
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| − | |||
| − | What I have never seen is testing of magnets on drives. Now, I have alot of nice strong rare-earth magnets, and I have some old drives which are all but ready to be decomissioned. |
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| − | |||
| − | === Testing external magnetic effects on [[Hard drives]] === |
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# setup computer with an OS and boot drive. |
# setup computer with an OS and boot drive. |
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# attach drive-to-test |
# attach drive-to-test |
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# format drive |
# format drive |
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| − | # write data, md5sum written data |
+ | ## consider two partitions, then read/write files on both to observe :D |
| − | # bring magnets to drive |
+ | # write data, md5sum written data (/dev/zero, or urandom data? Random size or predictable size? predictable sized zero data can have pre-known md5sums) |
| + | # apply test |
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# md5sum data again to check against bit corruption |
# md5sum data again to check against bit corruption |
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# consider 'spamsum' to check for how MUCH of the data is corrupted. |
# consider 'spamsum' to check for how MUCH of the data is corrupted. |
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| − | * consider applying all this in a loop which runs constant, generating files (/proc/partitions), md5sum, wait for magnets, md5sum again, delete and repeat |
+ | * consider applying all this in a loop which runs constant, generating files (/proc/partitions), md5sum, test, md5sum again, delete and repeat |
* 10meg files? |
* 10meg files? |
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| + | |||
| + | === [[Magnets]] === |
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| + | I have alot of nice strong rare-earth magnets (from hard drives...) |
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* test for effects of magnetic field when writing files as well as reading |
* test for effects of magnetic field when writing files as well as reading |
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| + | * test the effect of a moving magnetic field, vs a static one (as applied both before and after a format of the drive?) |
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| − | + | === foreign materials === |
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| − | == foreign materials == |
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* open breather hole, apply smoke |
* open breather hole, apply smoke |
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** thrash drive - how long till observable issues? |
** thrash drive - how long till observable issues? |
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| − | * open breather hole, but apply coke (alternate: drill hole) |
+ | * open breather hole, but apply liquid (water or coke) |
** will it seize up the drive? Or froth up the coke? |
** will it seize up the drive? Or froth up the coke? |
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| + | * Drill hole - shavings do what now? |
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* sparkler (inverted, through pre-drilled hole) |
* sparkler (inverted, through pre-drilled hole) |
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| + | * spray paint (after opening drive)** chalk spray |
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| + | ** metallic spray |
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| + | ** apply soot |
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| − | == Open drive == |
+ | == let's get physical... == |
| + | * you put your hard drive in, you pull your hard drive out, you put your hard drive in and you shake it all about |
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| + | ** (not innuendo) |
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| + | * melt solder to short or remove components |
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| + | * hit drive with a hammer (rubber, then metal) |
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| + | * drop drive (in as far as is possible when attached to cables) |
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* open drive entirely... :) |
* open drive entirely... :) |
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| − | ** create two partitions, then read/write files on both to observe :D |
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| − | ** apply soot to drive platters, then see patterns with head movement... |
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Latest revision as of 15:47, 15 December 2014
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[edit] Measuring drive performance
- A basic Linux utility to measure drive latency and throughput, and record these continuously.
[edit] Thrash the drive
Drive thrashing should involve the looping creation (write) and md5sum (read) and then deletion of files of random sizes. Data from /dev/zero
- Is this efficient really? Do we need random filesizes? How about a range of constant sizes? Or just constant sizes?
[edit] Destructive testing
Test a drive and then stress it till the tests break. Keep going till the drive breaks...
- setup computer with an OS and boot drive.
- attach drive-to-test
- format drive
- consider two partitions, then read/write files on both to observe :D
- write data, md5sum written data (/dev/zero, or urandom data? Random size or predictable size? predictable sized zero data can have pre-known md5sums)
- apply test
- md5sum data again to check against bit corruption
- consider 'spamsum' to check for how MUCH of the data is corrupted.
- consider applying all this in a loop which runs constant, generating files (/proc/partitions), md5sum, test, md5sum again, delete and repeat
- 10meg files?
[edit] Magnets
I have alot of nice strong rare-earth magnets (from hard drives...)
- test for effects of magnetic field when writing files as well as reading
- test the effect of a moving magnetic field, vs a static one (as applied both before and after a format of the drive?)
[edit] foreign materials
- open breather hole, apply smoke
- thrash drive - how long till observable issues?
- open breather hole, but apply liquid (water or coke)
- will it seize up the drive? Or froth up the coke?
- Drill hole - shavings do what now?
- sparkler (inverted, through pre-drilled hole)
- spray paint (after opening drive)** chalk spray
- metallic spray
- apply soot
[edit] let's get physical...
- you put your hard drive in, you pull your hard drive out, you put your hard drive in and you shake it all about
- (not innuendo)
- melt solder to short or remove components
- hit drive with a hammer (rubber, then metal)
- drop drive (in as far as is possible when attached to cables)
- open drive entirely... :)
