How To Defrag Iphone – With no ads, the ability to filter front-page stories, and a private.
Does the iPhone have some kind of automatic defragmentation feature because it has so little RAM and constantly has music, videos, podcasts, etc… reclaimed through it? Just wondering how it manages memory.
How To Defrag Iphone
With a physical hard drive, defragmentation helps line up large contiguous chunks of information together to keep the disk heads from bouncing around too much. When a drive becomes fragmented, constantly searching for data slows down the overall system as it physically moves around to find each piece of data. Defragmentation keeps the data together so that there is less movement of the disk head, thus increasing the speed of the drive.
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On iPhones that use flash memory, there are no physical heads that need to be moved around to find data. Data can be accessed equally quickly no matter where it is.
Also, if I remember correctly, flash memory intentionally fragments the data, spreading it to different places around the cell. The reason is that flash memory has a limited number of erase cycles. This extends the life of flash memory by not reusing identical parts.
Aphexii says: Also, if I remember correctly, flash memory intentionally fragments data, spreading it all over the cell. Click to expand… Yes, it’s called wear leveling.
Jeremy W said: It takes a long time. This PDF from Corsair explains everything very well: http://www.corsairmemory.com/_faq/FAQ_flash_drive_wear_leveling.pdf “Will my Corsair USB flash drive last 10+ years?” Note the passage. Click to expand…
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Will my Corsair USB flash drive last 10+ years? yes All Corsair flash drives have memory components that can handle at least 10,000 write cycles; Usually they will handle an order of magnitude more than that. So this means that to drain the drive in ten years, each block on the device would have to be written about 2.7 times every day. We simply cannot imagine such a usage scenario; This means that on a very common 8 GByte drive, more than 21 GBytes of data need to be written to it every day for ten years! USB flash drives will not be used this way. If anyone thinks they can actually try this, we recommend buying a Corsair Flash Voyager GT or Corsair Flash Survivor GT USB drive. They are built with components guaranteed for 100,000 write cycles. With these, a person can write more than 210 GB to the drive every day for ten years! Click to expand…
Since OS X itself doesn’t require defragmentation, and iPhone OS is built on top of it, I’m really skeptical.
Interstella5555 said: OS X itself doesn’t need defragmentation, and iPhone OS is built on top of it, I’m really skeptical. Click to expand…
While I agree that OSX does a better job of not needing defragmentation, so the iPhone doesn’t need it. See my post above.
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This is a good question… (although slightly off topic) Why doesn’t OSX require defragmentation? Is that a hard drive or a flash drive right?
ThunderBull4 says: Good question… (off topic though) why doesn’t OSX need defragmentation? Is that a hard drive or a flash drive right? Click to expand…
Do I need to customize? If you use Mac OS X, you probably don’t need optimization. Here’s why: Hard drives today are generally much larger than they were a few years ago. As more space becomes available, the file system does not need to fill every “corner”. Mac OS Extended Format (HFS Plus) avoids reusing space for deleted files as much as possible to avoid prematurely filling small areas of newly freed space. Mac OS X 10.2 and later includes deferred allocation for Mac OS X Extended Format volumes. This allows multiple small allocations to be combined into one large allocation in one area of the disk. Fragmentation is often caused by constantly appending data to existing files, especially if the resources have been forked. With faster hard drives and better caching, and new app packaging formats, many applications need to rewrite the entire file every time. Mac OS X 10.3 Panther can automatically defragment such slow-growing files. This process is sometimes called “hot file adaptive clustering”. Aggressive read-ahead and write-back caching means that minor fragmentation has less impact on system performance. For these reasons, defragmentation has little benefit. Note: Mac OS X systems use hundreds of thousands of small files, many of which are rarely accessed. Customizing them can be a major effort for little real gain. It is also possible that one of the files placed in the “tropical zone” for fast reading during system startup is moved during defragmentation, which can degrade performance. Click to expand…
A related text for those who fear PDFs… memory components that can handle at least 10,000 write cycles; Usually they will handle an order of magnitude more than that. So, this means that to drain a drive in ten years, each block on the device would have to be written about 2.7 times a day, every day…Click to expand…
Glow is fun. Especially when it’s a native chip, like in the iPhone, which doesn’t even have a flash drive. (Flash sticks and drives are very different from raw chips…they have wear levels, poor block management, and other internal logic…whereas memory chips don’t have that, and the OS itself has to spend time dealing with these things. )
Each block of memory is 256KB and needs to be erased and rewritten entirely, if you change only one byte.
Consider what happens if you have a 4GB device with 3.8GB of space taken up by movies and the operating system. There’s only 200MB available right now, and that’s fine for regular use.
So what the flash file system sometimes has to do is move files around to get the wear level. In other words, if this 200MB is used too much, it is logically moved to a different physical location, and the occasionally changing file (such as a movie data segment) is swapped with it, so there is no separate block of memory to write as much. .
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So is there a high risk of the phone’s memory block going bad or at least getting worse over time? Does this mean that in 3 or 4 years the phone’s OS will start ignoring 10-20% of hot memory areas? Does it slowly run out of available memory?
Aphexii says: While I agree that OSX does a better job of not needing defragmentation, so the iPhone doesn’t need it. See my post above. Click to expand…
(Node) I’m not tech-savvy enough to explain why iPhones, iPods, and Flash Drives don’t need to be defragmented. thank you
Trillium says: So over time, there’s a high risk that the phone’s memory block will deteriorate or at least deteriorate? Does this mean that in 3 or 4 years the phone’s OS will start ignoring 10-20% of hot memory areas? Does it slowly run out of available memory? Click to expand…
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Yes, blocks can deteriorate over time, just as hard drive sectors deteriorate. So the file system maintains an on-chip erase counter for each block to avoid reusing the same block too much. It should move files around to balance things out if it has to.
(For that matter, 100MB per 4GB nominal capacity can be bad at the factory and still be considered a good chip. For example, a 16GB chip can be 400MB bad from the start. This type of flash has high capacity, but is relatively cheap because it matures quickly. doesn’t have to.)
The original Samsung flash memory chips used in the first-generation iPhone had a lifespan of 5,000 write cycles. For iPods and other major playback devices, this is perfectly fine. For 13+ years, you ended the loop by rewriting your entire memory with a new movie, song, or app every day.
Of course, the bigger the chip, the longer you’ll have the device without seeing any loss, since there are more blocks to swap and reuse. If 1MB of flash is frequently used for network caching or application log files, it can be killed quickly. Maybe even in a few weeks. But 8GB is 8,000 times bigger and 8,000 times takes several weeks. That is a very long time. New to this series? You’ll get the best value from scratch, but if you want a buffet you can also use the chain overview.
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Like the Mac we discussed last week, one of the great things about iPhones and iPads is that they usually last