The hard disk interface is divided into five types: IDE, SATA, SCSI, SAS and Fibre Channel. IDE interface hard disks are mostly used in household products, and some of them are used in servers. SCSI interface hard disks are mainly used in the server market, and Fibre Channel is only used in high-end servers because of its high price. Most personal PCs use IDE and SATA. IDE is an old-fashioned interface that is used by fewer and fewer people these days. SATA is the most popular and most commonly used interface today.
Optical drive size
There are only two common sizes (thickness) of optical drives, one is 12.7mm and the other is 9.5mm. Generally, ordinary notebooks are 12.7mm, and only a few small notebooks may use 9.5mm or smaller.
DP，VGA，HDMI
The latest version of 1DP, V1.2, the resolution supports up to 4K 2/60 frames, which is higher than HDMI, HDMI supports 4K 2K/24 frames; in UHD, DP is better than HDMI; DP also supports 3D, audio;
HDMI, high-definition multimedia interface, you can see from the name, this main function is many, although HDMI is not as good as DP in the highest resolution, its best picture quality is 180P-1600P, 4K*2K only 24 frames; supports 3D, Ethernet, Audio (better than DP); of course, you have to buy a standard 19-pin, recommend "Kiyi HDMI", the material is standard, if you buy some non-standard, bad materials, it will not be up to the standard this standard;
DVI, 24+5 or 24+1 (dual-chain mode), the highest resolution (3840 × 2400) @ 33 Hz is similar to HDMI. No audio transmission, only video. DVI-I (24+5), which can transmit digital and analog signals.
VGA, analog signal, the highest resolution is 1600*1200; compared with the above three, it is much worse, the analog signal is not as clear as the digital signal
In general, DP is similar to HDMI, but the display may develop to DP, the main reason is that the resolution is higher and free, but now the mainstream of the display is HDMI. HDMI is copyrighted, and the copyright fee is divided into annual membership fee and product sales fee.
Thunderbolt interface
Thunderbolt can be connected to mobile hard drives and monitors, which are usually a little more expensive than other interfaces. In addition, you can directly connect two mac computers with two thunderbolts, copy things very quickly through "target disk mode", or use the imac as a display for a macbookpro.