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If you remove a USB data logger from the computer without pressing the eject button, the computer with the MacOS system will alert you to "Disk not ejected properly". But is it really necessary to remove this cache in a "civilized" way before turning it off programmatically?
Most likely not. The key is to bounce for at least a few seconds until all the copy from the cache or related actions is complete, then pull it bravely. That's right, it's best not to do it with external disk drives, especially those that have rotary drives, writes The Verge.
![Should I "disable the USB key" before deleting it? "Title =" Should we "civilize" the USB key before removing it? Width = "500" height = "305" border = "0" /> [19659004] This type of USB storage recovery procedure is not official and can not really be called conservative and absolutely safe In the worst cases, a file is copied, and maybe even all the support can be corrupted.
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"USB storage drives have been removed from my computer in the last five years, and I have never encountered any problems," said Dr. Frank Wang, Ph.D., Computer Science, Mbadachusetts Institute of Technology. Of course, this is not statistically valid, the data is guaranteed, but the doctoral student thinks that in almost all cases, "normal users will not do anything wrong".
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But let's see: what happens on a computer when you take out the disc and why is it so small that you risk being damaged?
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What can be wrong?<br />
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Let's start with a small context.
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Suppose you copy data from a computer to a USB storage device. Your computer can use the cached write cache: it does not overwrite data directly from one file to another, but uses an intermediate cache to increase the efficiency of this process . Accelerated memory is just like a computer memory area that can be used very quickly by the computer.
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"When writing on a computer, the computer first writes data into its memory, then pbades to a recorder and informs the user:" here I have written ", although the data has not yet been completely transferred to another storage device Carnegie Mellon University Associate Professor of Computer Science Andy Pavlo.
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When using cached write, the computer completes the copy process in invisible mode in the background. All of this, in our normal times, happens very quickly. "It's a countdown to a millisecond," Pavlo said. The MacOS operating system uses cache memory in all cases, but Windows users have the option to choose to use it – by default, it is disabled.
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It is precisely in the memory management that accelerates the data that requires the ejection function. "The eject function of your computer basically says: I will remove the disc, so I will clear the recording cache," explained the professor's badistant.
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Knowing about the use of the cache is important because in theory there is a probability that the user finds that the computer has already finished burning, although it will not be the case. For this reason, Pavlo recommends that MacOS users always use the eject function: this operating system constantly uses the cache memory.
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And what can be the wrong thing if you delete it by copying it or if the cache is usually used?
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First, the copy file will be corrupted (but it is very likely that the original copy file remains healthy). It is also possible that other files of the same repository are damaged.
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The biggest problem that could happen if the USB support itself is corrupted: there is a small chance that coarse extraction will damage the systemic metadata, and the computer will not be able to determine where the data are stored.
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It should also be mentioned that SanDisk, a company that manufactures external data storage media (also known as USB storage media), recommends following the official protocol in all cases. "Whether it's a USB flash drive, an external disk drive or an SD memory card, we recommend you always turn it off in any way. security and then disconnect it from your computer, camera, or phone Without a secure uninstall, the user can unexpectedly shut down invisible system processes in the background, resulting in data corruption Said Brian Pridegone, product marketing manager for the company.
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What are the optimistic options?<br />
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Is it worth it to bite and take this second of your time to click the Eject button? "Basically, it will not be a big difference.In case of catastrophic event, if you remove the support just for the moment you have started the write operation and that some bits have already been saved and others not yet, you risk damaging the USB storage device.However, their likelihood is so small that I have never seen them personally and I've never heard of anyone. One, "said Jim Waldo, a technology engineer at the John Paul AH Paulson School of Engineering and Applied Science.
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In other words, the possibility of damaging a USB storage device is very small.
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So if you're worried about interrupting the invisible processes in the accelerated memory after burning, it's not necessary: this process ends so quickly that people who do not have accelerated perception and surreptitious movement will not hurt.
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The doctoral student W. Wang agrees that in this case, the essential feature of the recording speed of modern USB storage devices is. "At this point, when it seems that the recording is over and the media can be removed, the process is really over," he said.
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In short, if you do not want to waste time and you do not want to damage the media or the data, follow these instructions: do not carry any media during the registration process and one millisecond after the end of the registration. Remember that your MacOS computer will definitely use cache memory, and Windows probably is not. The more modern equipment is, the more likely it is that nothing goes wrong.
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In the end, if you work with an external disk drive, there are very different rules (although a modern SSD is not easy to damage). For example, if you save your MacOS data with Time Machine, the eject button does not actually crash. Even more rigorous, this rule applies if you are using older discs with rotating discs: recording information on them lasts much longer than SSDs, and they contain moving parts, so the probability of mechanical damage can not be excluded.
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"If we talk about the threat of USB storage, the probability of any problem extraction without the eject button is minimal," Waldo said. The bigger the threat is when inserting such media: who knows what is written and what its content can have on your computer.
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<img decoding=](http://www.elektronika.lt/_sys/storage/2018/07/18/usb.jpg)
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