wholesale personalized jewelry cards The hard disk is damaged. Do you need to do what you need to do after changing a new hard disk to make the hard disk work normally? Or can I synchronize the data by inserting it?
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velvet jewelry rolls wholesale Sports storage unit, including random memory (RAM), only read memory (ROM), and high -speed cache (Cache). It's just because RAM is the most important memory.
The memory usually refers to the RAM in the computer system. RAM requires continuous power supply every moment, otherwise the data will be lost.
If the data in RAM after turning off the power, it is not lost, so that every time you turn on, you can ensure that the computer is in a state of shutdown. Re -open the application. But RAM requires constant power supply. Is there any way to solve this problem? With the advancement of technology, people think of a way to supply a small amount of power to RAM to keep the RAM data from being lost. This is the dormant function of the computer. In particular, this function in Win2000 has been well used. The power supply is in a connection state during dormancy, but it consumes a small amount of electricity.
The interface forms of memory strips, there are two common memory barns: single -column direct insertion memory (SIMM), and dual -row direct -inserted memory bar (DIMM). The SIMM memory bar is divided into 30 lines and 72 lines. DIMM memory strips increased to line 168 compared to SIMM memory strips. DIMM can be used single, different capacity can be mixed, and SIMM must be used in pairs.
The manner of memory, the memory also has FPA EDO DRAM and SDRAM (synchronous dynamic RAM).
FPA (Fast Page Mode) RAM fast page mode Randomly access to memory: This is the common memory of the earlier computer system, which transmits data once each three clock pulse cycles.
edo (Extended Data Out) RAM extended data output random access memory: EDO memory cancels the time interval between the two storage cycles of the motherboard and memory. , Greatly shorten the access time, which is to increase the storage speed by 30%. EDO is generally 72, and EDO memory has been replaced by SDRAM.
s () DRAM synchronous dynamic random access memory: SDRAM is 168, which is currently the memory used by Pentium and above models. SDRAM locks the CPU and RAM through the same clock together, so that the CPU and RAM can share a clock cycle and work simultaneously at the same speed. Essence
DDR (Double Data Rage) RAM: SDRAM's update replacement product, he allows transmission data at the rising edge of the clock pulse, so that the frequency of the clock can double the speed of the SDRAM.
RDRAM (Rambus DRAM) memory bus -type dynamic random access memory; RDRAM is a new type of DRAM developed by system bandwidth, chip to chip interface designed by Rambus. He can pass within a high frequency range. A simple bus transmission data. He also uses a low -voltage signal at the same time to transmit data on both sides of the clock pulse at a high speed. Intel will add support for RDRAM to its 820 chipset products.
The main parameters of memory: storage capacity and access time. The larger the storage capacity, the more information that can remember by the computer. The access time is calculated in nan seconds (NS). One nano seconds equal to 10^9 seconds. The smaller the number, the faster the access speed of the memory.
The difference between hard disk and memory is very large. Here we only talk about the most important points: 1. Memory is a computer's workplace, and the hard disk is used to store the information that is unused temporarily. Second, memory is made of semiconductor materials, and hard disks are magnetic materials. Third, the information in the memory will be lost with power, and the information in the hard disk can be stored for a long time.
The connection between memory and hard disk is also very close: only one point here: the information on the hard disk is always unused for the time being, do you need to use it? Please put in memory! The CPU and the hard disk do not have direct data exchange. The CPU only controls the signal command of the hard disk. The information on the hard disk can be processed only after loading the memory.
Reference information:
M memory is the place where the storage program and the data. In, when you choose the deposit disk, the data in the memory will be stored in a hard (magnetic) disk. Before you understand it, you should also know its physical concept.
● Reading only memory (ROM)
rom means that only Read only memories are read. When making ROM, information (data or program) is saved and saved permanently. This information can only be read, and it is generally not written. Even if the machine is powered off, these data will not be lost. ROM is generally used to store the basic programs and data of the computer, such as BIOS ROM. Its physical shape is generally integrated block of dual -column direct insertion.
● Random memory (RAM)
The Random Access Memory means that data can be read from it or data. When the power supply is closed, the data stored in it will be lost. The memory bar we usually buy or upgrade is used as a computer memory, and a small block of the memory bar (SIMM) is a small block plate that concentrates the RAM integrated block. It is inserted on the memory slot in the computer to reduce RAM integration Space occupied. At present, the common memory strips on the market include 4M / bar, 8m / bar, 16m / entry, etc.
● High -speed buffer stuff stuffing (Cache)
cache is also the concept we often encounter. It is located between the CPU and memory. It is a storage that reads and write faster than memory. When the CPU is written or reads the data in memory, this data is also stored in a high -speed buffer storage. When the CPU needs these data again, the CPU reads the data from a high -speed buffer storage, instead of accessing slower memory. Of course, if the required data is not in the cache, the CPU will read the data in the memory again.
The division of the memory can be summarized as follows:
● Basic memory occupies 0 to 640kb address space.
● Keep memory occupying 640kb ~ 1024KB address space. It is allocated to the display buffer storage memory, ROM and system ROM BIOS on each adapter card. The remaining space can be used as the upper memory UMB. UMB's physical memory is taken from physical extension memory. The physical RAM in this range can be used as Shadow RAM.
● The upper memory (UMB) uses the address space of the unprecedentedly used in the reserved memory, and its physical memory is obtained by a physical extension memory. UMB is managed by EMS and its size can be set by the EMS driver.
● High -end memory (HMA) extended the first 64KB area (1024KB ~ 1088KB) in memory. Established and managed by HIMEM.Sys.
● XMS memory conforms to the extended memory area of XMS standardized management. Its driver is HIMEM.SYS.
● EMS memory conforms to the expanded memory area of EMS standardized management. Its driver is EMM386.exe, etc.
The character in the computer
In in the computer industry, the term of memory is widely used for RAM (random access memory) computer uses random access memory The temporary instructions and data required for storage execution operations enable the computer's CPU (central processor) to read instructions and data stored in memory faster quickly.
For example, when the processor loads an application -such as text processing or page editing program -to memory to enable the application to execute in a fastest and most efficient way. In terms of practical value, the loading memory can ensure that the computer can perform operations in a shorter time to make the work more quickly.
. The difference between memory and storage
Most people often confuse the memory (Memory) and storage space (Storage). Refers to (Memory) The capacity of the random access memory installed in a computer and storage (Storage) refers to the capacity of the hard disk in the computer to avoid confusion. We compare the computer to an office with a desk and a file cabinet.
Imagine the metaphor of this desk and file cabinet. Imagine the situation that you must find a file or a data clip every time you want to read a file or a data clip, which will greatly reduce the speed of work execution, let alone pushing people crazy. If you have enough desk space (such as memory), you can spread the required files and immediately find the required information.
The most important difference between another memory and storage is that the information stored in the hard disk can be kept complete after shutdown, but any data stored in the memory will be lost after the computer is shut down. Just like in the metaphor of the office, any file or file left on the table after get off work will be discarded.
Memory and performance (Memory and)
The increase of memory in the computer system can increase the effectiveness of the computer. If the memory does not have enough space, the computer must create a virtual memory file. In this process, the central processor retains a space in the hard disk to replace the additional random access memory. This program called "Swapping" reduces the speed of the system. The hard disk access requires 12,000,000NS. Specifically, it is equivalent to spending four and a half months to complete the work that can be completed in three and a half! The "external deposit" of the computer. Memory should be some memory inside the computer (on the motherboard) to save intermediate data and calculation results of the CPU operation. These data are sometimes saved on the hard disk. At present, the memory of the computer is generally 16m, 32m, 64m, 128m, 256m, etc. The size of the hard disk is 4.3G, 6.4G, 8G, 10G, 20G, 30G, etc.
The hard disk is a major computer storage medium, consisting of one or more aluminum or glass discs. These discs are covered with iron magnetic materials. Most hard disks are fixed hard disks, which are permanently sealed and fixed in the hard disk drive. However, it is now more and more popular with mobile hard disks, and there are more and more types.
The hard disks used by most desktop computers either use the IDE interface or the SCSI interface. The advantage of the SCSI interface hard disk is that at most seven different devices can be connected to the same control panel. Because the hard disk rotates at a constant high speed at a constant high speed of 3000-10,000 per second, it only takes a short time to read the data from the hard disk. In the laptop, the hard disk can stop rotating during idle to extend the time of the battery. The minimum storage capacity of the old hard disk is only 5MB, and it uses a dish with a diameter of 12 inches. The current hard disk has a storage capacity of as high as tens of GB. The diameter of the disc used in desktop hard disks is generally 3.5 inches. The diameter of the disc used in the hard disk used by laptop is generally 2.5 inches. New hard disks are generally formatted in the assembly factory through low -level formatting, the purpose is to store some original sector identification information on the hard disk. The full name of the hard disk English is (Hard Disk), which is literally translated as a "solid disk". From the appearance, the hard disk is very similar to a four -square metal box with a size of 5.25, 3.5, 2.5, and 1.8 inches. There are several types of notebooks and some pocket precision instruments. Nowadays, 3.5 -inch plates are commonly used in desktop machines. The hard disk is a data storage center of a computer system. Most of the programs and data we use when we run the computer are currently stored on the hard disk. The position of the hard disk in various fixed storage devices is the most important (other storage devices include floppy disks, CD-ROM, tape, mobile drive, etc.). The hard disk used by desktop computers either uses the IDE interface or the SCSI interface. The advantage of the SCSI interface hard disk is that at most seven different devices can be connected to the same control panel. Because the hard disk rotates at a constant high speed at a constant high speed of 3000-10,000 per second, it only takes a short time to read the data from the hard disk. In the laptop, the hard disk can stop rotating during idle to extend the time of the battery. The minimum storage capacity of the old hard disk is only 5MB, and it uses a dish with a diameter of 12 inches. The current hard disk has a storage capacity of as high as tens of GB. The diameter of the disc used in desktop hard disks is generally 3.5 inches. The diameter of the disc used in the hard disk used by laptop is generally 2.5 inches. New hard disks are generally formatted in the assembly factory through low -level formatting, the purpose is to store some original sector identification information on the hard disk.