External SSD choice: M.2 hard drive + adapter box v.s. Samsung T5

Replies

• Anonymous1911 Mar 29, 2019
  USB transmission speed is very slow, right? Even 3.1 is only a theoretical speed
• Poster Mar 29, 2019
  I seem to know that although WD's Blue is actually an M.2 interface, it is still SATA. It needs to be an intel interface to be a real M.2, but the price is more expensive at 1,600 yuan. Is that right?
• Poster Mar 29, 2019
  @ Anonymous1911 Generally, how much is it reasonable to discount the actual speed compared with the theoretical speed?
• Anonymous1912 Mar 29, 2019
  The speed of M.2 SATA protocol is similar to that of ordinary SATA SSD, and even more similar after USB 3.0. But if your computer doesn't have Type C, even if you use an M.2 NVMe SSD, the speed won't increase much.
• Anonymous631 Mar 29, 2019
  nvme is definitely a little more expensive than sata, but the bulk of the price is still granular
• Poster Mar 29, 2019
  @ Anonymous1913 Thank you, I think whether it is an external box or a finished product like Samsung T5, the interface is usb3.1 gen2, which should be 10G bandwidth, but I don't know how much it can actually be and I need a discount
• Poster Mar 29, 2019
  @ Anonymous631 But I feel that the speed is much different. sata's speed is only 500M, and nvme's feeling is above 2G
• Anonymous1912 Mar 29, 2019
  @ Poster I have a hynix M.2 SATA, I use an adapter cable, the Type C write speed is about 200m, and the laptop is about 450-500. I have a Samsung 970 EVO, but I have tried it without a cable, I guess it will be faster, after all, it is in NVMe format.
• Anonymous1914 Mar 29, 2019
  M2 NVMe SSD hard disk box, tried several computers, usb a and C, the write is 400 megabits/second, C is only a little faster than A Don't explain any problem, for reference only
• Anonymous1915 Mar 29, 2019
  Your thinking is correct. Generally, SSD + usb-A 3.0 can read and write about 400-500. 4K read and write is not particularly bad, and it can definitely be used for WinToGo The ssd of m2 still uses the sata protocol. As long as the hard disk box can have the speed of usb-A, it is enough. I looked at it and it seems that this kind of product is around 99 yuan-150 For nvme, the theoretical speed is 1000-3000MB/s. Only the Thunderbolt 3 hard drive box paired with usb-c can reach a speed above 1000. usb-c alone is useless. But how many people need speeds higher than 500MB/s?
• Anonymous1916 Mar 29, 2019
  I'm curious if the guys upstairs who said they were dissatisfied with running have ever used it? Don't force your answer to mislead LZ. My personal 500G M.2 NVMe + Type-C Gen2 box, the actual reading and writing of large files is above 910M/s. The SATA SSD is generally about 500M/s. If by "good things" you mean speed, it can indeed be that fast. In addition, let me just tell you that the current mainstream M.2 NVMe SSD read speed is around 2700-3300M/s, and the write speed changes significantly. Generally, 250G is around 1600M/s, 500G is around 2400 M/s, and 1T is around 3100 M/s./s or so. So if you buy a hard drive of more than 500G and replace it with a box that supports Gen 2x2 in two years, this hard drive can continue to run at the theoretical speed of Gen 2x2 (20Gbps). P.S. The box you mentioned is less than 100, so I'm afraid to use it. For 500G hard drives, mainstream brands float between 500-800, and the box is 200. P.P.S When using this thing, what you have to worry about is not the speed of running, but the temperature after running at full speed, which is scarily hot. It is recommended that you pull it out as you use it. If you want to connect it for a long time, get a small usb fan to actively cool it down.
• Anonymous9384 Mar 29, 2019
  It seems that the only thing that can run NVME is the Thunderbolt 3 hard disk box, but it is not cheap. The optical box costs 1,000 +, and the device must have a Thunderbolt 3 interface
• Anonymous1916 Mar 29, 2019
  @ Anonymous9384 I feel that LZ's goal is to slow down the theoretical bandwidth of Type-C Gen2. This low cost is feasible. What's more, Thunderbolt 3 now has a twin brother called USB4. After mass production in two years, it will naturally become cheaper, and it will not be too late to buy it then.
• Poster Mar 29, 2019
  @ Anonymous1913 There is so much difference, it seems that the connection speed of the adapter cable is worrying? Or do you use usb3.0? But 3.0 also has 5G, it seems that this discount is very strong
• Poster Mar 29, 2019
  @ Anonymous1914 It seems that the bottleneck is still usb. Are you using usb 3.0 or 3.1 gen2?
• Poster Mar 29, 2019
  @ Anonymous1916 Thank you, so the practicality of usb3.1gen 2 is still very high, and the bandwidth of 7.3 G is relatively close to the theoretical speed of 10G. Also ask, will I get hot if I don't read and write? I looked at several boxes and all specifically mentioned the heat dissipation structure. Is it so horrible that several memory chips heat up?...
• Poster Mar 29, 2019
  @ Anonymous1916 Yes, because the light box of Thunderbolt 3 will cost thousands, and my theme is comparing two schemes with similar costs. I feel that if the costs are close, the gap between the speed of 910M and the speed of 400-500M is still very obvious. Also, I would like to ask if the blue of WD I saw still belongs to sata. Even if the interface is M.2, its speed is still not fast, right?
• Anonymous1912 Mar 29, 2019
  @ Poster No, the adapter cable port is Type C to Type C. My notebook is also Type C, and it is the Thunderbolt 3 port. It may also have something to do with the cable.
• Anonymous1917 Mar 29, 2019
  @ Poster M.2 is just an interface specification, and the speed mainly depends on the master control, particle, and transmission protocol If used with a USB 3.1 Gen 2 hard disk box, you can pay attention to WD's newly launched SN500. The performance will not overflow too much, and the price is cheaper than that of a black disk
• Poster Mar 29, 2019
  @ Anonymous1913 That would be weird.. The bandwidth of usb3.1gen2 is greater than SATA, it should be able to run full SATA