what is disk defragmentation

There are many ways to install the system, the traditional method is to use the system disk to install, this method due to time-consuming and laborious use of a few, currently the most used system installation method is the U disk boot disk. U

support better, for the original XP system or ghost system, it is recommended to make a PE system to install. 3, with two user feedback of the PE system for other users to use, you can also download their own online to the PE system. (The following two PE files belong to the original author all, this post for the convenience of users, summary download address in this, if the copyright information involved, please contact the original author, this po

features can significantly improve performance. 7. Fast fsck. previous fsck First step is slow because it checks all the inode, now EXT4 adds a list of unused inode to the Inode table for each group, so the fsck Ext4 file system can skip them and only check for the inode that is in use. Out. 8. Log check. logging is the most commonly used section and can easil

The index database introduces the most frequent operation of the index user to the database is the data query. In general, a database needs to search the entire table for a query operation. When the data in the table is very large, it takes a long time to search the data, which causes the server to waste resources. In order to improve the ability of retrieving data, the indexing mechanism

What to do if forced removal leads to u disk damage? When you can not safely delete a U disk could forcibly unplug the U disk? Of course not! This time if forcibly removed, it is easy to damage the computer U-port or your USB drive. If you have important information on you

What about WIN10 Super Fetch disk 100% Super fetch a read-through mechanism since windows7, which can be simply closed if the disk is heavily occupied. Right-click on my Computer, select the Properties function, enter Select the service option, and then in the list of services on the right, follow the or

privilege fixes to make your Mac run faster, because this usually doesn't affect you very much. Finally, no matter what version of the system you run, even Yosemite, mavericks, mountain lion or older tiger, Snow leopard, and so on, regardless of the normal system, repair system, Single-user mode, The methods and procedures for disk rights fixes are the same. 　　How to Repair

　U disk transmission speed and what about? U disk transmission speed is mainly with u disk format, u disk interface, u disk solid-state granular chips and operating system-related. 1,

Using a U disk to start maintenance system is more and more commonly used, but you know how to make a U disk boot disk need to pay attention to what problems? Now it's one by one for you. 1, make a startup disk before please ba

thatDatabase recovery will take place after the system crashes.Transactions that are used to restore and revoke a system crash in an active stateThe impact on the database,Thus guaranteeing the atomicity of the transaction.The system changes any actual data on the disk beforeThe information that modifies the operation information itself is logged to disk.When a crash occurs,The system was able to record th

Presumably in daily life, many users will use the U disk, now the U disk development is really very fast, from the previous 512MB to the present 64GB or even greater memory, we can see, we are more and more for U disk requirements, for U disk demand

1, Kafka is what. Kafka, a distributed publish/subscribe-based messaging system developed by LinkedIn, is written in Scala and is widely used for horizontal scaling and high throughput rates. 2. Create a background Kafka is a messaging system that serves as the basis for th

What are the advantages of U disk installation Win7? System failure? Then reinstall the system, in fact, there are many ways to reload system: U disk installation, virtual CD-ROM installation, hard disk installation, CD-ROM installation, as well as ghost installation and so on. Today, the novice friends briefly say

resolved NetUpdateService.exe This process if the user name item is system then should be your Automatic update service, if not automatically updated, it is best to turn off, so as not to waste resources. 17. What file is Online services? Answer: Use the internet! Can't delete! 18,

Q: Recently, when I was cleaning up the disk, I found that there were as many as MB of "Old compressed files", all partitions, and I couldn't remember what I did before. After cleaning, all the compressed files in the partition become blue, and I re-built the system yesterday, after installing XP, I found that the compressed files before formatting the hard disk

of their action? What is the size of their decision? Which is faster? How does the JVM stack correspond to the OS? Before you answer this question, you must first know that the mechanism of memory management differs depending on the compiler and processor architecture. To help understand, first summarize several principles:　　

built-in message for Windows to receive the originator His role is that you don't have to go to the mailbox every time you need to open Outlook Express can send and receive mail! Level: He is the software to send and receive e-mails. Developed by Microsoft. 　What file is Reference assemblies? Answer: System relate

What to do when you move the hard disk to the computer without displaying the letter letter: It is also possible that the mobile hard disk will not display properly because the USB interface is disabled. In response to this type of situation, small part of the proposal in B

Generally, in the w764-bit flagship edition, our local disk are C, D, E, F, the composition, even if there is a U disk or hard drive intervention, will generally use H, K, G and other symbols to name, and from another level, our local disk generally not too much, Because too many disks can cause too little capacity on

Now the reload system is no longer a technician thing, as long as you have a Help your U disk Loader master, you can install your favorite system for your computer. However, when the system is being re-installed, if you find that the hard disk or C drive is not found? Then,