Purchase causes
The change of the hard disk is also a lucky coincidence. In the first few days, my mac mini upgraded the latest system, the cup, the boot constantly restarted, crashed display five countries map, there are photos, a lot of ideas, and finally engage in 2 Days, hung up under the window to copy things out, and then formatted, reinstall the system, and then engage in two days, and finally determined that Razer's cloud driver can not be compatible with macOS Sierra , halo, and then reinstall the system , Back to the old OSX El Capitan above, think about this mechanical hard disk is old (not to use 200 hours, the main still too slow), might as well change ssd to play. The remaining 500G mechanical hard disk gave the Thunder mine machine a black job. Changed a 1t mining tray down to do black group Hui special backup photos and mac, behind it has been waiting, has been waiting
However, on the evening of September 19, the child woke me up and could not sleep, brushed Aunt Zhang, and then saw the goods. Â
Then it is not calm, at 4 o'clock in the night, immediately calculated the price, really cheap, on the order (the main fear is that late JD will not allow the use of coupons, and later did not really restrict the use of coupons not long after the 459 ) Use coupons 400-30, then -10 Jingdou, send 50 Jingdong E cards, finally white bars -10,349 prices, Oh, the first-tier makers SSD on this price, but also awkward bicycles, decisively into the Such as delivery, your sister's, is actually a pre-sale, and then wait until the 22nd today before delivery.
Purchase experience:
I was also an old player of SSDs. In 2011, I entered the first SSD in my life.
At the time of the discount, 500, although now look at the speed is not fast, but in that era, it seems pretty good read 200MB, think that more than 80 mechanical hard disk read faster, and affect the system speed experience 4k read Get faster than many entry products now. Now it is not ready to replace, because the 60G installation system plus common software is enough, and there are 1000G mechanical storage things also run up fast, it is estimated that it will wait for many years before changing.
Many years of experience tell me that buying SSDs mainly depends on the 4K speed. This is the biggest factor affecting the user experience. 4K is not fast and the speed will not feel fast. This is why I have been working hard for 5 years and think that it is faster. . When choosing to buy is also tangled election MLC or TLC, climbed countless posts also relieved, others say that SSD is not bad, is not used for a long time out of bad, think about my 60G SSD with 5 years More than never stopped, the system is equipped with N times or performance is good, life problems do not have to worry about, I guess my 60G SSD but also in the main machine but also will not feel slow for several years. JD.com saw a lot of SSDs, then determined a few requests and can use JD coupons. Â , about 250G, preferably MLC, compared Italian Rainbow and Taipower's two, saw the colorful, 299 sold for a long time now to buy 359, too pit, no, and then Taipower also out of stock, wait until the present goods
Then in the process of waiting for the process of research, and finally found that this is the eTLC, is the TLC Enterprise Edition, it can be considered a small surprise, life above the TLC, on the whole feel very worth it, to point Baidu Encyclopedia
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Whether they are SLC, MLC, or TLC, they are all flash-cut flash particles (also known as “Dieâ€, which can be made up of one or more circuits and eventually packaged into a single NAND flash unit) (Figure 1). The more advanced the production process (such as upgrading from 19nm to 15nm), the more flash particles are cut from each wafer (Figure 2), which means lower cost. The problem has arisen. There is a concept of yield in the production of silicon semiconductor integrated circuits such as wafers. Not every wafer is perfectly qualified.
In the field of NAND flash memory particles, we are accustomed to refer to wafers that have not passed any inspection (cut out flash particles) as "black patches", which are the wafers with the highest failure rate. Unfortunately, these "black films" are rarely destroyed by fabs, but they are distributed through a number of channels and are often used in Shanshan flash memory disks. Fortunately, few vendors will use it for SSDs, or else it will be enough to drag them back after repairs.
Some flash particles have gone through a screening process at a fab, but they have not passed the original fault detection. Such “chips†are often purchased by second-tier hard disk manufacturers. At this time, hard disk manufacturers will use their own in-plant inspections to screen "snapshots." Any flash memory that passes the inspection will be called "white sheet" (also known as "Good Die"). Although the factory inspection is not as strict as the original factory monitoring, the quality of the “white film†is still guaranteed.
If flash particles pass the fab's original screening and fault detection, they will be referred to as "original particles" and printed on the wafer surface (such as Toshiba, Micron, Hynix, Flash). Di, Samsung, Intel) Logo and model parameters and other information (Figure 3). If you take apart an SSD and find that the flash memory is not a mark of the fab, it is marked with an SSD vendor's own Logo (such as the Kinston logo) (Figure 4). Basically it can be concluded that the SSD is using flash memory. The "white film" in the particles.
The consumer market is focused on speed, while the enterprise market is focused on stability. This potential customer demand has also led fabs to branch out in the screening of flash granules.
In order to meet the requirements of the enterprise market, the fab will select the best part of each wafer and conduct stringent tests according to enterprise-level standards. Any data integrity and endurance test will be achieved. The standard part of the flash memory will be defined as "eMLC" (Figure 5) or "eTLC" (Figure 6). In other words, any prefix with the "e" is the enterprise-class flash memory that the fab offers to SSD manufacturers. Compared with ordinary MLC and TLC, these enterprise-level flash memory particles have more P/E numbers (longer life) and better stability.
It should be noted that if you want to excavate the advantages of “eMLC†and “eTLC†in terms of lifetime, you need to match the designated master chip and firmware algorithm. If an SSD vendor uses eMLC/eTLC with an ordinary master controller, it cannot achieve the high P/E value that these enterprise-class flash memories should have.
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According to my understanding, lifespan is eSLC>SLC>eMLC>MLC>eTLC>TLC. Of course, the price of SLC is too high and the general market is basically extinct. As long as it is not used as a normal brand, the SSD life of Dachang Brand is guaranteed. Normally, SSDs are reserved for more than 10 20 G. Basically, they will not run out (my six years ago, the SSDs have not worn out, just like the ones just bought).
Well not much nonsense, say
The packaging has always been JD.
After the dismantling is the hard disk body, without any protection
Anti-counterfeiting label details, JD self-employed, and the first shipment, too lazy to verify.
On the back of the box, printed some hard disk basic parameters, etc.
The family portrait, this is all things, Q300 had sent a thick hard tape, this time the A100 is gone.
Hard disk front photo, material is metal, surface matte, with Toshiba's label is very simple, very Toshiba.
On the back of the hard disk, basic information such as the capacity, encoding, and current of the hard disk are printed.
Hard disk interface, brand new, no machine traces.
Fragile stickers, tear off no warranty.
First measure the speed and then use. Very fast, faster than my old hard drive, much faster than my brother Q300.
Machine process
This time the new SSD is for the mimic mac and the live replacement process.
Remove the back cover first.
Then remove the four screws from the fan, remove the fan and cable, and remove the plastic block next to the fan
Remove the four screws on the cover of the hard disk, remove the cover, and pay attention to the antenna above, then remove the hard disk and pull out the hard disk.
Put the hard disk fixing screws on the new hard disk, it is very simple to install and remove the order.
Then install the system, plug the various cables, plug in the system U disk prepared in advance, press and hold the alt key to enter the boot selection screen. Because the new hard disk is not partitioned, there is no way to display it here.
Wait for a while (a few minutes)
Finally pop up the installation menu, first click on the disk tool partition, and then click on Install macos.
Click on the partition to select the hard disk, then click Erase above the menu, then the installation diagram, select, and then click erase. That's it.
Return to click Install to enter the installation interface, click to continue
Select the installed hard disk, just erased hard disk. Then click Install
Then you can wait. The above display shows about 7 minutes. Don't believe me. I waited for more than half an hour.
Waiting process does not need to be in charge, then enter the setting menu, and WIN10, set up can enter the desktop.
Last installed desktop map.
The actual experience, the biggest feeling is a word, fast, positive TM fast, before the boot to be 2,3 minutes, now as long as 2,30 seconds, and running a variety of programs are clicked to pop up, almost There is no delay. Unlike the previous website, it took a few seconds to wait. The gap between mechanical and solid-state gaps is still very large. One takes a plane in the sky and one rides a bicycle on the ground.
Final summary
advantage
1, Dachang's products, the price is still cheap (starter, special offer and the last few days to the end of the 30th) price is very high
2, strong performance, the price of this solid state capacity, no one can exceed this speed. The Q300 at the same door will also cry in tears.
3, life is guaranteed, enterprise-level eTLC with enterprise-level main control, beyond the life of the general TLC.
4, good workmanship, quality assurance, 3 years after sales
5, have to say it looks good, good texture, and then no noise you will hit me?
Shortcomings
1, now Jingdong do not use coupons, but unfortunately.
2. There are no gifts, no screws, no lines.
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