If it is sent by a company, a Netac authorization letter is required.
If you send it personally, you do not need a Netac authorization letter. You only need to attach a personal belongings guarantee letter.
Personal effects Explain Letter
Personal effects Explain Letter
To Guangzhou/Shenzhen Airport Customs:
To Guangzhou/ShenzhenAirport Customs, < /p>
My parcel’s waybill number: ____________________
My Parcel Tracking#:
The items contained in the parcel are as follows:
Parcel contain below goods:
Product name? Brand/Model/Material Quantity? Value?
Description Brand/Model/Material Quantity Price
_______________ ______________ ________ ________?
_______________ ______________ ________ ________?
_______________ ______________ ? ________ ?________?
_______________ ______________ ________ ________?
_______________ ______________ ________ ?________?
Drug guarantee:_________________________________________________________.
For Medicine need guarantee:
Book/CD guarantee: __________________________________________________.
For books/CDs need guarantee: ?
Specific purpose: __________________________________________________.
Detail Usage
Since I am not at the scene, I authorize the staff of FedEx Co., Ltd. to accompany the customs to inspect the goods. Any legal liability shall be borne by me. I hope the customs will release the tax and release the goods.
Because I will not be available at customs site during inspection.Hence,I appoint Fedex employee to assist customs officer withinspection process.If you have any problem in this process/law,please contactme.
< p>Personal Signature:Personal Signature
Date:
Date
The hard disk is one of the main storage media of the computer and consists of a Or multiple aluminum or glass discs. The disc is covered with ferromagnetic material.
Hard drives include solid-state drives (SSD drives, new hard drives), mechanical hard drives (HDD traditional hard drives), and hybrid hard drives (HHD, a new hard drive based on traditional mechanical hard drives). SSD uses flash memory particles for storage, HDD uses magnetic disks for storage, and hybrid hard disk (HHD: Hybrid Hard Disk) is a hard disk that integrates magnetic hard disk and flash memory. The vast majority of hard drives are fixed hard drives, permanently sealed and secured within the hard drive.
Magnetic head reset energy-saving technology: Save energy by resetting the magnetic head when idle.
Multi-head technology: Speed ??up the hard disk by adding multiple heads on the same disk to read or write at the same time, or use heads to read or write on multiple disks at the same time to speed up the disk. Multi-purpose on servers and database centers.
Rotational Speed ??or Spindle speed is the rotation speed of the motor spindle in the hard disk, which is the maximum number of revolutions that the hard disk platter can complete in one minute. The speed of rotation is one of the important parameters that indicates the grade of the hard disk. It is one of the key factors that determines the internal transmission rate of the hard disk and directly affects the speed of the hard disk to a large extent. The faster the hard disk rotates, the faster the hard disk searches for files, and the relative transmission speed of the hard disk is also improved. The hard disk speed is expressed in revolutions per minute, and the unit is RPM. RPM is the abbreviation of Revolutions Per minute, which is revolutions per minute. The larger the RPM value, the faster the internal transfer rate, the shorter the access time, and the better the overall performance of the hard drive.
The spindle motor of the hard disk drives the platter to rotate at high speed, creating buoyancy that causes the magnetic head to float above the platter. To bring the sector of data to be accessed under the head, the faster the rotation speed, the shorter the waiting time. Therefore, the rotational speed determines the speed of the hard drive to a large extent.
The speeds of ordinary hard drives for home use generally include 5400rpm and 7200rpm. High-speed hard drives are also the first choice for desktop users; while for notebook users, 4200rpm and 5400rpm are the main ones, although some companies have released 10000rpm hard drives. Laptop hard drives are still relatively rare in the market; server users have the highest requirements for hard drive performance. SCSI hard drives used in servers basically use 10,000rpm, and even 15,000rpm, and their performance is much higher than that of household products. Higher rotational speed can shorten the average seek time and actual read and write time of the hard disk. However, as the hard disk rotation speed continues to increase, it also brings negative effects such as temperature increase, increased motor spindle wear, and increased operating noise.