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drives require at least Win7 operating systems to support them, and that if you install a WinXP system, the lifetime of the SSD is reduced. So we recommend the Win7 or later operating system. 3. How to use solid-state hard disk loading system First, the AHCI mode on the motherboard is turned on. AHCI implements the native SATA functionality by including a PCI BAR (base address register), which allows for a wide range of features such as NCQ, hot-swappable, etc. The solution is to turn on AHCI
students are very proud of things, to read the "Computer newspaper bound" is already a luxury. ??????? It's been 15 years since I came to 2018 years, is Desktop Linux mature? This is really not a sentence to say two words can be clearly said things. Can only tell you: "Life is a toss"! Today, I would like to write "full use of Deepin Linux Entertainment, work, study." #个人声明 ??????? The individual is not a Linux fanatic, in Microsoft embraced the Open source era, as the pot-man I have no reason
image format (1920x1080) and a data ratio, NHK has submitted a new draft of ITU-R BT.709 recommendations. 2 years later, with the addition of the 24/25 Hz format, HDTV began to emerge in the film industry. As a global cooperative project, the birth process of the 709 proposal is the crystallization of wisdom and the product of compromise.2.1.7ITU-R recommendation BT.2020In the second half of 2012, the International Telecommunication Union radiocommunication Sector (ITU-R) issued a new generatio
stored program, Norflash storage data.There is a dedicated storage controller for storage space 2440, Generally we put Norflash, Nandflash are connected with nGCS0, and then choose OM0, OM1 choose which way to start, if you choose Norflash our code will start from the Norflash 0 address to execute, If you choose Nandflash our code will be the processor will nandflash the first 4k copy to the inside of the chip 4k
the Inode entry, the mapping to the block is not done using the pointer index, but instead of the pointer by extent, the previous 15 in ext3The pointer is replaced with 5 extent, and a extent occupies 3byte space; a extent describes a contiguous set of blocks that, when not enough, extent can still pickThe index of the indirect pointer, but with no number limit.Note : For extent calculation of a single file size algorithm, has not been found out, did not read the source code. If you read the me
: ./a.out001e3000 120K r-x-- /lib/ld-2.12.so //bank and the following two behavior dynamic linker ld.so code snippet, data segment, BSS segment 00201000 4K r---- /lib/ld-2.12.so00202000 4K rw--- /lib/ld-2.12.so00209000 1600K r-x-- /lib/libc-2.12.so //bank and below are code snippets, data segments, and BSS segments in C library 00399000 4
It is well known that after the upgrade of SSD, the speed and performance of the computer have been greatly improved. However, some users upgrade SSD, speed and performance improvement is not obvious. The reason is that the SSD is not properly used and the operating system is installed. The common problem is that the 4K is not aligned, does not turn on the trim, the system garbage too many causes. How to build a perfect and fast computer system on SSD
appears again in the fifth step-loop confirmation. This shows the number 2n, n≥1, the lowest number in four digits 2, 4, 8, and 6 cycles.This cycle tells us that the power of the same 2 of the end number is correlated, and their exponent differs by 4: Ends in 2: 21, 25, 29, 213, 217, .... Ends in 4: 22, 26, 210, 214, 218, .... Ends in 8: 23, 27, 211, 215, 219, .... Ends in 6: 24, 28, 212, 216, 220, .... You can use the exponential arithmetic rules to describe more succ
" phenomenon. Sharp Panel, the original Samsung 4K screen, Sony speakers, foreign top processors, etc., become the most happy to use the hardware terminology of domestic TV brands. In the complacent, show their superior integration strength behind, I see is the independent research and development technology input cost huge fear, the lack of self-confidence. Only foreign ordinary, or even outdated hardware to comfort their empty heart, and even "decei
ID of the last processor is 0, then the number of CPUs is 1, so it is 1 CPU * dual-core Another example: processor : 0vendor_id : AuthenticAMDcpu family : 16model : 8model name : AMD Opteron(tm) Processor 4171 HEstepping : 1cpu MHz : 2094.686cache size : 512 KBphysical id : 0siblings : 4core id : 0cpu cores : 4apicid : 0initial apicid : 0fpu : yesfpu_exception : yescpuid level : 5wp
device can be used as a cache for multiple devices and can dynamically add or delete a cache when the device is running. 2. Abnormal shutdown and recovery. The write is completed only after the data is written to the disk in the cache. 3. Correctly handle write blocking and brush cache 7/25/12 random test SSD disk is Intel 160g mlc ssd, that is, Intel SSDSA2M160. FIO is used as a performance test. The test script is as follows: FIO runs on an SSD bare device, but this type of performance test s
links, and files in the specified file system, while the DF command obtains the total block count and the remaining blocks by viewing the file system disk block allocation graph. The file system allocates some of these disk blocks to record some of its own data, such as I nodes, disk maps, indirect blocks, super blocks, and so on. This data is not visible to most user-level programs, often called Meta data. The du command is a user-level program that does not consider meta data, while the DF
upgrade, the phone prompts for at least 4.7G of space to be installed, and countless 16GB versions of iphone users do not erase some photos and apps from their phones. This also exposes the majority of 16GB users in normal use, the remaining space will be less than 5G, or even less. In daily use, a game hundreds of MB, big game or even more than 1GB of the situation is common, often listen to music will need to cache to local at least hundreds of trillion space, plus more and more commonly use
effect on performance.System optimization--memory interpolation method6 in the presence of 4 channels in the interpolation method is: 2/2/1/1, referred to as 42 interpolation method6 in the presence of 4 channels in the interpolation method is: 2/2/2/0, referred to as 33 interpolation methodhp/dell/Huawei/UK Industry comparison:hp/dell/Huawei maintains 42 interpolation performance with a higher performance than the 33 interpolation method. Numa is turned on, the QPS elevation 8-20%;numa is off,
Behaviors dynamic Link program ld.so code snippet, data segment, BSS segment 00201000 4K r---- /lib/ld-2.12.so00202000 4K rw--- /lib/ld-2.12.so00209000 1600K r-x-- /lib/libc-2.12.so //bank and the following are the code snippets, data segments, and BSS segments of libc.so in library C 00399000 4K----- /lib/ libc-2.12.so0039a000 8K r-
all on a disk, this command is equivalent to the test disk's simultaneous reading and writing capabilities Here are a few common DD commands to see the difference DD bs=64k count=4k If=/dev/zero of=testDD bs=64k count=4k If=/dev/zero of=test; SyncDD bs=64k count=4k If=/dev/zero of=test Conv=fdatasyncDD bs=64k count=4k
. In 80386, the size of the page is fixed at 4K bytes, and the boundary address of each page must be a multiple of 4K. Therefore, the 4G size of the address space is divided into 1M pages, the start address of the page has the form of "xxxxx000h". To do this, we refer to the high 20-bit xxxxxh of the page start address as the page number. The number of the linear address space page is the high 20 bits of th
algorithm cannot solve a graph with a "negative weight loop" (or "negative weight loop") because there is no shortest path with a "negative weight loop" diagram. For example, the following figure does not have the shortest path from vertex number 1th to vertex 3rd. Because 1->2->3->1->2->3->...->1->2->3 such a path, each time around a 1->-2>3 such a ring, the shortest path will be reduced by 1, never find the shortest way. In fact, if a figure with a "negative weight loop" then this diagram is
save his friends, save his inventions to the homes of Westinghouse Electric Company and abandoned the unprecedented amount of patent tax, but focused on the invention research , together with Westin House to let AC power to the country. It is precisely because Tesla indifferent to fame and wealth, the attitude of focusing on scientific research so that he in a round of slander and slander in the outside, still focus on research, to achieve the world'
OriginalJanuary 2015My father is a mathematician. When I was a kid, he worked at Westinghouse for a long time, modeling nuclear-weapon reactors. He is one of the few lucky ones who knew what he wanted to do in childhood. When you talk to him about your childhood, you will find a watershed in the age of 12, when he became interested in maths. He grew up on the coast of Poole Helley, England. We traced his way to school from Google Street View, and he
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