Early in the 386/486 dos era, I started to play desktop computers, and gradually evolved into high-performance CPUs such as pentium, Pentium II, Pentium 4, Core i3, Core i5, and Core i7. The storage device evolved from Punched Tape, Magnetic Tape, Floppy Disk, Compact Disk, and Hard Drive. In 2011, Intel introduced SSD as a technology to buffer disk performance (SRT), which has good stability, long life and high speed. With many advantages, such as reading capabilities, Solid-State Drive (SSD) is a new generation of storage devices. Punched Tape: can store 80 columns of data data Magnetic Tape: Traditional linear sequential storage Floppy Disk: Early removable storage device media 3.5å‹ and 5.25å‹ floppy disk drive Compact Disk: uses the principle of optical reflection and interference to interfere with the reflected data of the stored data pit (Pit) projected onto the CD and convert it into digital signal playback. Hard Drive: The head is used to change the difference caused by the magnetic properties of the disk covered with magnetic material to store digital signals. Solid-State Drive: Control chip + flash memory Memory structure, the principle is to store different voltage value signals to the Flash Memory through the control chip. The following is a description of one of the best quality notebooks evaluated in 2017, the hardware introduction and performance test of the Lenovo Lenovo 720S-14IKB. Box appearance Fig Fig1 Hardware specification sheet Table I Appearance introduction 3-1. Lenovo 720S-14IKB has a special slim design and is very suitable for business trips. The length and width of the notebook are about 32CM, 22CM, 1CM and weighs about 1.55kg, as shown in Fig.2. Fig2 3-2. From right to left, HDMI, USB3.0 (can be charged through USB charging treasure when the notebook is off), Type-C (PD+Thunderbolt), SD card reader, as shown in Fig. 3. Fig.3 3-3. From right to left is the Novo button (Novo button is, Lenovo notebook special function, one-key restore function on ideapad series), 2-in-1 audio jack, USB3.0, battery/charge status indicator , AC power rectifier jack, as shown in Fig. 4. Fig.4 3-4. Introduction of keyboard interface, the distance between buttons and buttons, the island design is ergonomic and suitable for long-term computer input operations, as shown in Fig. 5. Fig5 3-5. On the back, the JBL speaker output sound is quite clear and loud. There is no need for an external speaker to have a good audio and video effect. The fan output vent has a layer of dust-proof filter, as shown in Fig6. Fig Fig6 Remove the back cover and observe the SSD 4-1 There are 10 star screws on the back. Use a star screwdriver to turn the screw counterclockwise, as shown in Fig. 7. Fig Fig7 4-2. After disassembling the screw, you can see the Lenovo battery, fan, and NIC chip using Intel® Dual Band Wireless-AC 8265NGW chip, providing 802.11ac 2.4GHz+ 5GHz dual-band, up to 867Mbps transmission speed, SSD MZ-VLW5120 SSD PCI-E M.2 PM961, as shown in Fig. 8. Fig.8 Windows10 system information Fig9 CPU and motherboard information 6-1. CPU adopts Intel Core i7-7500U, 2 core 4 execution sequence, the basic flat rate is 2.7GHz, and the maximum overclocking is 3.5GHz, as shown in Fig.10. Fig10 6-2. The motherboard adopts Lenovo special LNVNB161216, Intel Kaby Lake chipset, as shown in Fig11. Fig.11 6-3. Test the CPU with CINEBENCH R15, as shown in Fig. 12. Fig12 SSD information 7-1. SSD uses NVMe SAMSUNG MZVLW512, as shown in Figure 13. Fig13 7-2. SSD performance test 7-2-1.Samsung PM961 specifications, as shown in Table 2. Table 2 7-2-2. Use the SSD-Z test, as shown in Figure 14. Figure 14 7-2-3. Use the CrystalDiskMark test, as shown in Figure 15. Figure 15 to sum up For those who often need to carry a computer to go out, the Lenovo ideaPad 720s is suitable for work or entertainment Lenovo notebooks, no matter its light weight, keyboard keys, music on the Dolby Atmos design, can experience comfort and entertainment, but also Lightweight and convenient for work. SSD uses the latest M.2 PCIe interface slot. With the growth of 3D TLC NAND Flash, it can be easily DIY upgraded. The notebook Lenovo ideaPad 720s is a good choice.
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