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Old 05 February 2015, 16:58   #1
Nibbler
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Defrag a Compact Flash Card

Hi Folks.

I wonder, if a "Defrag for a Compact Flash Card" is Good or Bad.
Some say, its not necessary, because it has no moving parts.

Other´s say, it destroys the CF Card.
Some say, it speed things up, even on an CF card.
Quiet Confusing
I try´d it with a test Partition and it worked just fine.

So what do you think about that?

Defrag a CF Card ? YES or NO ? More speed ? Yes or No ?
and what do you think of that programm. ( it was faster then Reorg )

http://aminet.net/package/disk/optim/DiskOptimizer

I fount no Thread about this,
so i hope it helps others to END this CONFUSION

thanks, dear Amiga Board Members.
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Old 05 February 2015, 17:13   #2
lesta_smsc
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From my knowledge, there is no need to defrag flash devices. Equally, by doing so, you increase the read/write on them and this can reduce the lifespan of the drive.
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Old 05 February 2015, 17:41   #3
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If you notice thrashing of the CF card's read/write heads during operation, then by all means defragment it
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Old 05 February 2015, 17:45   #4
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Quote:
Originally Posted by bdb View Post
If you notice thrashing of the CF card's read/write heads during operation,
Solid state media has no "heads".
Seriously doubt defragging would make any difference, as a CF card has no seek time.
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Old 05 February 2015, 17:55   #5
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Thanks

So, NO DEFRAG on COMPACT FLASH CARDS , right ?
Now we know
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Old 05 February 2015, 18:28   #6
lesta_smsc
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No defrag for any flash drives/SSD
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Old 05 February 2015, 18:35   #7
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Quote:
Originally Posted by lesta_smsc View Post
No defrag for any flash drives/SSD
Now its official
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Old 05 February 2015, 19:20   #8
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Quote:
Originally Posted by bdb View Post
If you notice thrashing of the CF card's read/write heads during operation, then by all means defragment it
No, that means you need to do a head alignment.
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Old 05 February 2015, 19:36   #9
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FLASH can be defragmented and sometimes it is recommended - with time files fragmentation occurs and combining may improve data recovery in case of problem related with storage.
On PC some software is equipped with special option to defrag FLASH.

http://www.mydefrag.com/faqgeneralin...emorydisk.html
http://www.pcworld.com/article/20475...-your-ssd.html

So performance improvement - not likely especially for Amiga where there is no DMA transfer for CF, data safety - probably yes.
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Old 05 February 2015, 20:19   #10
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flash has an internal map for wear leveling and bad cells, defrag will make things worse. dont do it.
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Old 05 February 2015, 20:25   #11
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Quote:
Originally Posted by Yakumo9275 View Post
flash has an internal map for wear leveling and bad cells, defrag will make things worse. dont do it.

Ok, DON´T DEFRAG a CF CARD

Thanks guys, you´re the best !!
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Old 05 February 2015, 22:24   #12
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Fragmentation is a by product of filesystem design. The whole concept of defragging largely came about with MS-DOS and their File Allocation Table (FAT, FAT32 etc) file system. Other file system such as ext on Linux don't require defragmentation because they don't spread individual files across non contiguous sections of the disk.

Fragmented filesystems slow down when the heads on a mechanical drive have to seek around the physical media more than would otherwise be necessary to read/write files. When it comes to flash media, whether it's a CF card or an SSD, defragmentation of file systems is unnecessary because there are no physical heads moving around, so the fragmentation has a no significant effect on performance. Plus as mentioned above, the sectors in flash media have a limited life span so defragmentation for the most part is just wearing out your flash media with no purpose.

I'm not knowledgeable about SFS, PFS and FFS on Amiga, but I wouldn't be half surprised if their designers made these filesystems so that fragmentation was either a non-issue or silently dealt with in the background... However if someone knows of a defrag tool for SFS or PFS (for HDDs) I'd like to know about it.

Last edited by rikbliz; 05 February 2015 at 22:43.
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Old 06 February 2015, 00:10   #13
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Question

Quote:
Originally Posted by Akira View Post
Solid state media has no "heads".
Seriously doubt defragging would make any difference, as a CF card has no seek time.
Really?

Quote:
Originally Posted by Zippy Zapp View Post
No, that means you need to do a head alignment.
Only those with so sense of sarcasm require that.

Last edited by prowler; 06 February 2015 at 00:14. Reason: Back-to-back posts merged.
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Old 06 February 2015, 00:41   #14
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I think the discussion is settled... let's not wage war over this people!
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Old 06 February 2015, 09:02   #15
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Thank you for the discussion, gentlemen. Let's leave it at this. :-)
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