Decentralization of Blu ray storage

3. DVD 16x is 21600k / s. Blu ray 1x is 4500k / s. 6x should be 27000 or so. It's almost the same as 16x.
Blu Ray's bit rate is very high. Even a few minutes' MV Blu Ray's bit rate is 51m. Its size is 1.6g. When Blu ray is put on, the read data volume of Blu ray drive or Blu ray recorder is very large In addition, the advantage of optical storage is very obvious, that is, hard skin. Yes, the price of hard disk is lower than that of DVD disk with the same capacity. But are you afraid of static electricity? Are you afraid of collision? Are you afraid of dampness? Are you afraid of the magnetic field? Are you afraid of X-rays? There are so many factors that can cause hard disk problems. Are you afraid of using hard disk for long-term storage? These discs are not afraid. Azo dye discs can even withstand ultraviolet light now.
discs are even 50g blue light. If the disc is broken, it will lose 50g. How much do you lose if 1TB is broken? Is general data worth restoring? Why American libraries even use their own internal non lending data on CD rather than hard disk

4. 720p is a progressive scan up to 1280 × 720 resolution display format
the resolution of 1080p is 1920 × 1080
to put it simply, 1080p has a higher definition than 720p< br />____________________________________________
Blu ray BD is just a kind of storage technology, which can store 25gb optical discs on a single disc
similar to its concept are VCD and DVD, with different storage sizes
but in the end, the video stored on it has resolution, that is, 720p, 1080p or even higher
ordinary discs, such as VCD DVD, can only store 480p SD films because of capacity limitation.
with Blu ray storage technology, there is a disc for storing 1080p resolution films
with the capacity of 25gb, you can store 1080p or 720p, even the blurred video.

5. Blu ray film means that the storage medium of the film is Blu ray; 4K movie means that the resolution of the movie is 4K. The two concepts are not the same level and cannot be compared. Blu ray can also store 4K movies. 1. Blu ray disc, also known as Blu ray disc, is often referred to as BD. It is the next generation of high-quality video and audio storage disc media after DVD (it can support full HD video and high-quality audio specifications). Blu ray or Blu ray disc uses a shorter wavelength blue laser to read and write data. Blu ray greatly improves the storage capacity of optical disk. For optical storage procts, Blu ray provides a leap forward development opportunity. 2. 4K digital film refers to the resolution of 4096 × 2160 digital film, also known as 2160p, which has 4000 pixels in the horizontal direction, is the highest resolution digital film at present. At present, most of the domestic digital movies are 2K, with a resolution of 2048 × 1080, and some digital movies are 1.3k (1280 × 1024), and the so-called rural film is 0. 8K (1024 × 768). In the real sense, 4K movies are shot by 4K cameras and projected by 4K projectors. Other 4K films are shot on 35mm film and then converted into 4K digital format. Because the resolution of the previous film is about the same as 4K or slightly better, the clarity of the film can be ensured after transcription.

6. Failure code analysis of Blu ray motherboard
ER2: door interlock is disconnected ring elevator operation
phenomenon 1: ring operation, the door knife collides with the door wheel to disconnect the door lock
phenomenon 2: if fu16 is set to on, the system judges whether the door lock is closed or not, which is related to the closing limit signal. If fu16 is set to on, the closing limit is not allowed, which will also cause er03 protection
phenomenon 3: the motherboard detects the door lock signal using two-way detection, x14 is the contact input, x23 is the door lock circuit voltage detection, if the door lock circuit voltage is not high enough, the standard requirement is AC110V, if it is lower than AC100V, the unstable high-voltage input will also cause er02 fault
phenomenon 4: er02 fault occurs on the top floor, and the traction machine is synchronous. When the holding brake action delay time of synchronous traction machine is too long, it is easy to cause the elevator to rush to the limit. When this phenomenon occurs, 02 fault occurs before the emergency stop fault When the elevator stops at the top floor normally, the enabling direction will remain at the set time after the system stops. When the brake is not closed stably, the converter still has torque output. If the door lock is accidentally disconnected, the contact of the door lock will cut off the inverter, causing the pulley limit
phenomenon 5: the door switch signal of frequency conversion door machine is directly led from the control cabinet to the car roof from the traveling cable. If the interference is too large, the door operator controller will receive the door opening instruction wrongly in the operation process, which will cause er02 fault. In this case, the door opening and closing relay can be installed on the car roof. The control cabinet will drive the door opening and closing relay on the car roof first, and then the contact of the relay will control the door operator controller to open and close the door. This method can effectively prevent door opening and closing signal interference from causing door crane misoperation< Er03: inverter fault
phenomenon 1: inverter fault, according to the fault code to determine the cause of the fault
phenomenon 2: e to the long power on time of some frequency converters, which exceeds the power on waiting time of the system, the system reports the frequency converter fault, which can not be handled, and the system will automatically recover after the power on of the frequency converter
phenomenon 3: if the frequency converter proces over-current protection, and there is er02 or ER10 protection at the same time before the protection, it is generally caused by the immediate shutdown of the front protection, and the system will automatically recover after other protections are restored
er04: the running direction detected by the main board is opposite to the given running direction
phenomenon 1: if the input a and B of the main board encoder are connected reversely, er04 protection will be generated, and the input a and B of the main board encoder can be adjusted relatively
phenomenon 2: the encoder is out of phase, for example, one phase of a or B phase pulse cannot be input correctly. When this phenomenon occurs, er04 will be generated only when it runs in one direction, while the other direction operates normally. Check the reasons for pulse phase missing: 1. Determine which phase is missing first and remove phase A. if the main board has speed feedback, it means that phase B is normal and phase a cannot input normally. On the contrary, if there is no speed feedback, the B-phase input is abnormal. 2. Check if the phase of frequency division output of PG card is normal. 3. Check the motherboard for damage
phenomenon 3: the elevator runs in reverse. The actual running direction of the elevator is opposite to the given direction. The lack of phase (one or two phases) between the inverter and the motor results in the opposite pulley when the inverter has no torque output. Er04 protection is caused, which will exist when Xiwei inverter or Yaskawa inverter is not equipped with phase loss protection function. When the top pulley is used, it will also cause the phenomenon of topping
er05: brake opening fault: ① the system outputs the brake opening command, and the holding brake contactor does not feed back the signal to the main board within 0.5 seconds, or the contactor contact does not open within 0.5 seconds after the system outputs the holding brake command
② after the system outputs the brake opening command, the brake arm has no feedback within 2 seconds, or the brake arm switch does not open after holding brake (when brake feedback is set to no)
phenomenon 1: when the elevator starts, er05 fault occurs, which is mostly caused by poor contact of holding brake relay. When the fault time is recovered, there is no such protection when starting again. If there is too much protection ring starting, it is recommended to replace the relay
phenomenon 2: 05 fault occurred ring parking. The main reason is that the holding brake relay can't spring up quickly. In this case, please replace the holding brake relay
phenomenon 3: the feedback of the brake arm is incorrect, there is a door lock running in the opening circuit, and the contact of the holding brake relay is poor, which may cause the brake not to open normally
phenomenon 4: the installation position of the brake arm switch is incorrect, and the brake arm switch cannot operate normally
er06: ring operation, the input signal of door area keeps on
phenomenon 1: one or two of the two door area sensors stick together, causing the door area signal to be valid all the time ring operation
phenomenon 2: the gate area signal input line is short circuited with other signal lines
phenomenon 3: after the elevator starts, the wire rope slips in the door area
er07: the number of encoder pulses detected by the main control computer board is too small ring operation
phenomenon 1: after the given speed of the control system, the inverter does not operate at the given speed. Possible causes: 1. Poor contact of speed given connecting line (analog given signal line or multi section speed given signal line). 2. The set running time of frequency converter is too long, and the timing is given in many sections. Some models of frequency converter have the setting of opening delay running time. If the set time is greater than 2.5 seconds, the protection is easy to appear. 3. If the load is too heavy, the inverter can not be started or the starting process is too slow
phenomenon 2: the pulse input wiring of the encoder has poor contact, and the pulse cannot be input into the main board normally
phenomenon 3: the frequency division output of the frequency converter is damaged, and the frequency division pulse cannot be input
phenomenon 4: the input port of the main board encoder is damaged and can not receive the pulse input. (use the multimeter to test the tp9 and TP10 test points of the main board. When the elevator is running at low speed, the voltage value of the multimeter should fluctuate between 0-5V. If the fluctuation is normal and there is no pulse input, the main board is damaged and needs to be returned to the factory for repair

7. Later, I checked on the Internet about the storage time of the discs. Based on my own experience, I think that the storage time of DVD discs may be only three to five years. If you use the discs made by the miscellaneous brand DVD discs or the miscellaneous brand recorders, the storage time may be shorter (using the ordinary DVD drives to read normally is the standard)
the normal service life of the same disc may be prolonged or shortened e to different storage methods and environments. The following is a warning issued by IBM storage experts: "the life of CD and DVD discs self recorded by users is very limited. According to the quality of the discs, these self recorded discs only have two to five years of life. If you want to extend their lifespan, you have to keep them in low temperature and dark places, but the extension time is limited. The cause of this problem is the dye coating on the surface of these discs. When recording, the recorder modifies the coating by heat and records the data
however, in the process of long-term storage or use, the dye coating will degrade, which will make the data "shift", and the laser beam can not read out the data. The service life of the discs sold in discount stores is generally only two years, and the service life of high-quality discs can be up to five years, but it is very difficult to distinguish between the two, because few businesses take the service life as their selling point. " The above "warning" is seen on the Internet, and it has not been confirmed whether it is issued by IBM, but for the sake of insurance, I would rather believe it.

8. The Blu ray
ISO image file
and BDMV folder stored on the hard disk are called the Blu ray original disk
, and different media contents are exactly the same, which requires 3D
HD player
support.