What is the maximum speed of a USB 3.0 portable hard drive
The maximum read/write speed of a USB 3.0 portable hard drive is about 500M/S
Generally, it is close to this speed at most, and can’t be leveled out
And you need a high-speed SSD or USB flash drive to do so
The read/write speed of a mechanical hard drive is about 200M/S at most. A little more
What are the theoretical read and write speeds of a mobile hard disk
As of 2015, the read speed of mainstream 2.5-inch branded mobile hard disks is about 50-100MB/s, and the write speed is about 30-80MB/s.
Most of the mobile hard disks are equipped with USB, IEEE1394, and eSATA interfaces, which are capable of providing high data transfer speeds.
However, the data transfer speed of the portable hard disk is still somewhat limited by the interface speed, especially on the USB1.1 interface specification, which will test users’ patience when transferring larger amounts of data.
The USB 2.0, IEEE1394, and eSATA mobile hard disk interfaces are relatively good.
USB2.0 interface transfer rate is 60MB/s, USB3.0 interface transfer rate is 625MB/s IEEE1394 interface transfer rate is 50~100MB/s.
When exchanging data with the host computer, it takes only a few minutes to read a large file in the order of gigabytes, which is especially suitable for video and audio data storage and exchange.
Mobile hard disk technical parameters
1. Speed: Speed is an important measure of the performance of the mobile hard disk, depending on the hard disk data transfer rate and rotational speed.
(1) Data transfer rate
The current USB1.1 interface can provide 12Mbps; USB2.0 interface can provide 480Mbps; IEEE1394a interface can provide 400Mbp; IEEE1394b can provide 800Mbps data transfer rate.
But in the actual application will be due to some objective reasons, slow down in the application of the transmission rate.
The speed of ordinary hard disk for home use is 5400pm, 7200rpm, etc., and the high speed hard disk is the first choice of desktop users nowadays; and 4200rpm and 5400rpm are the main choices for notebook users.
2. Power supply
In order to strengthen the power supply, the 2.5-inch USB portable hard disk will generally provide a power cord from the PS/2 interface or usb interface. This means that the drive will need to be connected to a PS/2 power cable when moving larger files.
Currently, mobile hard drives can be divided into three sizes: 3.5-inch desktop hard drives; 2.5-inch laptop hard drives; 1.8-inch micro hard drives.
3.5-inch desktop hard disk, has the advantages of fast speed, large capacity, but the volume is large, heavy maximum, carrying is not convenient, because it is designed for desktop computers, shockproof performance is poor.
2.5-inch laptop hard drive is designed specifically for notebooks, size, weight is smaller, in the anti-vibration aspects of the special design, good anti-vibration performance, in the current mobile hard drive in the most applications.
1.8-inch micro hard drive, also designed for notebooks, good anti-shock performance, and size, weight is also the smallest of the three, but the price is higher, the capacity is smaller, popularization is more difficult, more suitable for special needs of users.
Capacity is the storage space of the mobile hard disk, 160G and 250G is the mainstream capacity, but limited to the cost and practical use of the demand for general office and home applications, choose 80G or even lower 40G has been able to fully meet the needs.
At present, mobile hard disk common data interface USB and IEEE1394 two kinds of. USB is the current mobile hard disk of the mainstream interface, but also the computer almost all have the interface, with hot-swappable, standardized, can be connected to the external multiple devices and other advantages.
There are two standards for USB: USB1.1 and USB2.0. USB2.0 has a transfer speed of up to 480Mbps, which is 40 times faster than the USB1.1 interface.