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迅雷官方分析：为什么下载速度慢/卡99%/电脑卡？_我的网站
一 | Pyongyang, Oct 10 (UNI) North Korea on Monday said its recent barrage of missile launches were actually nuclear attack simulation on the South.
It comes as intelligence suggests North Korea is preparing to hold its first nuclear weapon test in five years, the BBC reported.
In recent weeks, Pyongyang has launched seven sets of missiles in response to recent US and South Korea drills.
On Monday, state media published extensive reports claiming the missiles were designed to carry tactical nuclear weapons.
These are small short-range weapons intended for use on the battlefield. They said the military practised loading the missiles with dummy versions of these miniaturised warheads.
They also claimed to have successfully simulated hitting South Korea's military bases, ports and airports, and said the launches were a warning to US and South Korea.
State news agency KNCA ran photos of leader Kim Jong-un overseeing and "guiding" the tests.
US and South Korea intelligence officials have been suggesting that the North may soon test a nuclear weapon for the first time since 2017.
Experts believe it could also use the opportunity to detonate a smaller tactical device for the first time - the sort which would fit into the missiles it has been testing, the BBC reported.
Last month Kim declared North Korea an "irreversible" nuclear power and revised its laws, allowing it to use nuclear weapons pre-emptively. Its previous policy had been to only use such weapons in response to an attack.
It has also markedly stepped up its frequency of missile firings this year, carrying out over 40 missile launches this year so far - its most ever.
Most of the launches in the past fortnight have been short-range missiles, which landed in the sea between North Korea and Japan.
But North Korea also fired a longer-distance missile over Japan last Tuesday - which analysts say is a new intermediate-range ballistic missile, based on the weapon's design.
This year has seen the North test-fire missiles from a variety of launch sites including trains and convoys - moving platforms which would make it harder for the weapons to be destroyed in a strike, analysts have suggested.
The analysts told BBC that Monday's state media reports framed the recent launches as "tactical nuclear operations units" - instead of describing them purely as missile tests - suggesting that North Korea has now developed a system for deploying smaller, short-range nuclear weapons.
The 25 September-October 9 barrage were a response to the US deploying its nuclear-powered aircraft carrier the USS Ronald Reagan to waters around the Korean peninsula, and holding joint drills with Seoul and Tokyo.
The acceleration marks a significant change from when Pyongyang pursued denuclearisation talks with then US President Donald Trump between 2018 and 2019.
Analysts also said North Korea is also reacting to South Korean President Yoon Suk-yeol's hawkish stance to the North and closer ties with the US.
UNI ING。1月11日：在当今快节奏的互联网时代，下载也面临着新的问题：使用机械硬盘的计算机“磁盘读写性能”无法跟上。当下载速度非常快时，使用机械硬盘的计算机可能会因为磁盘太忙而出现问题：下载速度突然减慢，计算机响应减慢，下载进度卡为99.9%。怎么了？迅雷官方解释了为什么下载速度突然减慢，电脑响应速度减慢，下载进度卡在99.9%等。
二 | 下载速度突然减慢：迅雷下载文件时，为了避免频繁向磁盘写入数据，磁盘读写性能下降。因此，迅雷的下载引擎首先将下载的数据保存到计算机的内存中。当积累了足够的数据时，它们会一起写入磁盘。这是迅雷下载引擎的“磁盘缓存”功能。
三 | 由于通过网络下载数据比将数据写入磁盘慢，因此可以确保池中的水不会溢出。但是如果池溢出，就会引起问题。
四 | 它体现在迅雷的下载引擎中，会导致程序崩溃等异常现象。
五 | 近年来，随着网络带宽的增加，下载数据的速度开始出现快于将数据写入磁盘的速度。当迅雷的下载引擎发现磁盘缓存快满时，它会自动降低下载数据的速度。让下载的数据尽快写入磁盘，在腾出足够的缓存空间后恢复原来的下载速度。
六 | 如果您的计算机使用的是机械硬盘，并且正在高速下载，下载速度会突然减慢。可能这就是原因。电脑反应慢下来：要深入了解这个问题，我们必须从“机械硬盘”的“先天缺陷”开始。首先看一张机械硬盘拆卸图。当“机械硬盘”读写数据时，上图中的“音圈电机”转动“磁头摆臂”，使摆臂顶端的“磁头”从“磁盘”表面高速飞行约1纳米，在“磁盘”上读写数据。
七 | 圆盘的表面看起来像一面镜子，实际上是由环连接的“轨道”组成的。
八 | 当需要读写的数据存储在磁盘的不同“磁道”上时，磁头摆臂在磁盘上来回摆动，使磁头在存储相应数据的磁道上飞行。这种行为被称为“寻找”。
九 | 由于头部摆臂是由音圈电机控制的纯机械结构，因此从发出指令到摆臂完成跟踪的响应时间约为10毫秒。相比之下，机械硬盘磁头当前位置数据的读写时间仅为寻道时间的0.1%，频繁的寻道操作会降低机械硬盘的响应速度。
十 | 这种“先天性缺陷”创造了机械硬盘的一个主要特征（随机读写比顺序读写慢得多）。例如，顺序读写的速度可以达到100Mb/s，但随机读写的速度只能达到500kb/s，仅为顺序读写的0.5%。
十一 | 理想情况下，当迅雷高速下载数据时，机械硬盘会努力将迅雷下载的数据写入磁盘。但事实上，计算机中不仅运行一个软件。其他软件，包括操作系统，也会产生读写磁盘的需求。其它软件读取和写入的磁盘数据往往位于其它磁道上，这将频繁地触发机械硬盘的“寻道”操作。因此，机械硬盘陷入了“随机读写”的泥潭，这不仅降低了霹雳的数据写入速度，而且降低了用户在计算机上操作其他软件时的整体响应速度。很多网友不知道99.9%的人下载了进度卡。
十二 | 事实上，在下载数据的过程中，迅雷会实时检查下载的数据，避免下载错误的数据。
十三 | 数据验证过程需要一定的时间才能完成。幸运的是，在大多数情况下，数据的下载速度比数据验证的速度慢。因此，当数据下载完成后，验证数据的过程也可以同时完成。下载任务能够顺利完成。但是，当网络下载数据的速度超过数据验证的速度时，等待验证的数据将生成积压。下载的文件越大，下载速度越快，需要验证的数据积压越多。此时，如果添加前两个问题，则检查积压数据的速度将变慢。当下载任务的文件数据已经下载，但仍有大量未更正的数据积压时，迅雷的下载引擎会将任务调度保持在99.9%，直到所有下载的数据都被检查完毕，任务才会被下载。所以当你观察到迅雷有很快的下载速度时，却突然失去了速度，当任务进度达到99.9%时，迅雷上出现“磁盘忙”的提示，这可能就是为什么。然而，应该注意的是，还有许多其他原因可能导致99.9%的下载进度卡，这只是其中之一。
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Published on:15:05:13