My MacBook air was bought in early 14th, and the previous Thinkpad T400 was stolen in the 13th summer vacation! However, Thinkpad T400 also completed his historical mission and did a lot of things during college. Said more meat hurts, after all, is spent 9,999 yuan to buy a student machine with high in 2009, full of memories!
At that time, buying air was really hot, and the only advantage of using it was that it was lighter and easier to go out. But the performance can only be lightly worked, p maps. Just work relatively poor, so bought a 13-inch low air: 4G memory, 128GSSD. Here we recommend that you buy 8G memory, because the memory is soldered on the motherboard, can not be upgraded. The hard disk space can be expanded through the built-in SD card slot later.
Because of the need for office convenience, with a dual system installed, 128G space gradually became insufficient. A few days ago someone wanted to copy a good 36G film to see me, and the result was direct, space is not enough, can only watch the film tears. In order to prevent this from happening again, you must expand your storage space. First of all to buy a TF card to SD card sets, buy links:
This card set is very cost-effective and mainly cheap. Only a silver arc is highlighted on the air, and the matching is still good.
According to the evaluation of other online buyers, the card sleeve should be about 7.5mm on the pro model, which is ugly:
It is recommended to buy a little expensive, recommend:
This card sleeve work in general, there is no detail, the highest only supports 64G TF card, but think about the price will be considered, 9.9 can still God
After buying the card cover, the next step is to buy a card. The Majia water is too deep, or go to the tea house to buy it. Samsung is more reliable.
Samsung's work is still possible.
The bullets crashed
Come and come, papapa!
Oh, not bad.
Capacity 63.99G, no shortage of two
Speed ​​measurement software: Disk Speed ​​Test, ATTO Disk Benchmarks
Speed ​​environment: computer USB 3.0 interface
1, Disk Speed ​​Test U disk read is 85.7M / s, write is 25.5M / s. I heard that this software is hurting the hard drive, scared me almost lost the hard drive
2, ATTO Disk Benchmarks test U disk maximum read is 88.7M / s, the maximum write is 28.1M / s.
Taken together, the reading speed should be around 85M/s, and the writing speed should be at 25M/s. Meets Samsung's official promotion speed.
Advantages and disadvantagesAdvantages: Dual system can put some common data files on the TF card, so that there is no need to switch off the system. The data file synchronization between the two systems is very convenient.
Disadvantages: 1, only support 64G TF card, the capacity is generally like, only suitable for light office. 2. In the Win system, if the system goes to sleep and wakes up again, it will not recognize the TF card. This is a pit. Fortunately, usually usually use the Mac system.
To sum up, this solution is not one-step capacity expansion, after all, only 64G expansion capacity, but it is more economical ~
To say it, today's technology is the same day by day. In the past few years, optical fiber was still an advanced term, and the price of optical fiber equipment was also scary. Nowadays, optical fiber has begun to spread widely, and the price of optical fiber equipment has dropped with the development of technology. At the same time, with the development of technology, there are more and more vocabulary, such as the PoE-ONU we are going to talk about today.
Advantages of PoE-ONU
Over the years, with the development of projects such as "light-in-copper-retreat" and "fiber-to-the-home", the popularity of ONUs has also become higher and higher. Friends who have worked on PON networks basically know ONU, which is an access terminal device used in PON network, which is equivalent to the access switch in our usual network.
The PON network is a passive optical network. The reason why it is said to be passive is that the optical fiber transmission between the ONU and the OLT does not require any power equipment. The PON uses a single optical fiber to connect to the OLT, and then the OLT connects to the ONU. The use of PON technology for networking can save half of the optical fiber, and the transmission distance is longer.
Although some expenses have been saved, can we save a little more? of course can! With the development of technology, more and more devices are connected to ONU. Many of these devices require power supply. As a result, the wiring is complicated and the operation and maintenance of the devices also require a lot of manpower. In some special environments, the inconvenience of power supply is even worse.
Reverse Poe Onu,Pd Onu,Client-Power Supply,Poe Power
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