treehouse tracks

1. HeadThe head is a key component of the hard disk to read data. Its main function is to convert the magnetic information stored on the disk to an electrical signal for external transmission, the working principle is that the resistance value of special materials changes with the magnetic field to read and write data on the disk. The quality of the head determines the storage density of the disk. 2. TrackWhen a disk is rotated, if the head is kept at a position, each head will draw a circular t

, the video frame is moved to the front, and the read audio frame is moved to the back; At the beginning of PMP2.0, jonny realized the shortcomings of 1.0 and redesigned the file format structure. I personally think this change is quite good:Starting from the file header, the sequence structure is as follows: 4 Bytes: it must be a "pmpm", pmp sign;4-byte: version number, 1, indicating version 2.04 Bytes: Video Format Mark, this is an improvement, to support encapsulation of a variety of video st

Disk Scheduling AlgorithmDisk advantagesLarge capacity, low price for each user. Storage information is not lost when the power is turned off.Physical Features The disk surface is covered with magnetic material, and information is recorded on the magnetic surface. Each track of the fixed head disk has a separate head, which allows the computer to quickly switch from one track to another. However, this requires a lot of headers and the device costs are high. A more general approach is that each d

Using Git on (two)7. Management changes　[The concept to understand] is for Git to track and manage modifications, not filesWhat is a modification? For example, you add a new line, this is a modification, delete a row, is also a modification, change some characters, is also a modification, delete some and add some,Also a modification, even creating a new file, is also counted as a modificationSuch as:-----------------------------------------------------------------------------------------------　　

9th Chapter Audio and videoLearning Essentials:1. Audio and Video Overview2.video Video Elements3.audio Audio ElementsThis chapter focuses on audio and video elements in HTML5, which are two native media elements to the HTML pageEmbed audio and video.A Audio and Video OverviewFirst, we need to understand two concepts: the container (container) and the codec (codec).1. Video containeraudio files or video files, are just a container file. Video files contain audio

on the network, which integrates multiple different types of audio tracks and subtitle tracks in a single file. 9, flvflv is the short name of Flash video, FLV streaming media format is a new video format. Because it forms a very small file, loading speed is very fast, making it possible to watch video files on the network. 10, F4V as a smaller and clearer, more conducive to the spread of the network in th

. Grid lines Grid lines have horizontal and vertical lines, and criss-cross lines cut the mesh container into the smallest unit 单元格 . Gridlines are numbered and numbered starting with the number 1. There are 6 horizontal lines and 6 longitudinal line. If you like, you can give the line a name, and a line can have multiple names. Cell The block of a green background in a grid cell is a cell, the smallest unit of measurement for a grid layout, and a total of 25 cells. Grid track Two adjacent grid

interface after the USB drive is launched, and open it. Enter MHDD, which has 2 options and asks you to choose that. The options are XXXXXX without SCSI and the like. I don't know what it means, I choose the second one. Make sure that the disc is placed and restarted after the BIOS is set from the CD, as the hard disk is not configured for the SCSI and SCSI drives. The next step is to select the hard drive to detect, see the capacity can be

F (i,j) Indicates whether I is taken from the front of a sequence, and J is taken from the front of the B sequence to spell the C sequence. Transfer of the self-repairing brain.A train yard is a complex series of railroad tracks for storing, sorting, or loading/unloading railroad cars. In this problem, the railroad tracks is much simpler, and we is only interested in combining and one of the trains into one

Summary In this chapter, you have learned a lot about rendering complex 3D objects, such as scenes, tracks, and creating checkpoints in racing games. Hope it can also be used in other games. Remember the following when creating a scenario for the game: It is always the first time to determine how players look at the scene. It doesn't really make much sense to look at a very good scenario. This scenario is only great at close quarters. It c

Python basics and python SummaryWhen I first learned Python, I learned and summarized it in the form of a mind map, which is suitable for review. For details, refer to "Python: Getting started to practice. Here is a summary of the Python Basics on the Datacamp Website: About DatacampDatacamp is an online learning website suitable for beginners of data analysis and machine learning. Each course is short and skillful. You can finish learning one course within four hours, and you

WebKit the following CSS settings scroll bar1. There are 7 main properties: ::-webkit-scrollbar The whole part of the scroll bar, you can set the width of what ::-webkit-scrollbar-button buttons at both ends of the scroll bar ::-webkit-scrollbar-track Outer Track ::-webkit-scrollbar-track-piece inner Rolling groove ::-webkit-scrollbar-thumb scrolling Slider ::-webkit-scrollbar-corner Corner ::-webkit-resizer Define the style of the drag block in the lower right c

File systemWindowsNtfsFAT32LinuxVFS: Virtual file system: different from the underlying file system, through a unified interface, output to the upper applicationExt2Ext3Ext4XfsFile system: The partition file on the line organization management, and the establishment of an index table, the file system has the kernel providesFormatting: Creating a file systemLow-level formatting: creating tracks, sectorsAdvanced formatting: Creating a file systemPartiti

is not recognized. Class name The class that emits the message or tracks the event. Method name The method that emits the message or tracks the event. Organization An organization that has applications that emit messages or track events. Products A product that emits messages or tracks events. Component A component within a product that emits a message or

Robot Time Limit: 1000MS Memory Limit: 10000K Total submissions: 8016 accepted: 2638 Description The Robot moving Institute is using a Robot at their local store to transport the items. Of the course the robot should spend only the minimum time necessary while travelling from one place into the store to another. The robot can move is along a straight line (track). All tracks form a rectangular grid.

began to learn grub. Of course, now the mainstream desktop has already used the Grub 2,grub 0.9x system now collectively known as Grub Legacy, only fix bugs, no longer develop new feature. But many of the company's servers run on grub. For example, our product is still grub. The following experiments I have done are based on the 2.6.24 kernel operating system, unlike the Ubuntu operating system at home. MBR and Stage1 The MBR is the abbreviation for the Master boot record, which is the master b

project managers, and also for IT professionals who are suddenly asked to "build a data Warehouse" and need to play the role of project manager. My discussion will not be complete, but I hope this will give you enough information to get your project ball rolling. As shown in Figure 1, the Data Warehouse project has 3 tracks (tracks): Data orbit, technology track, and application layer track. When you ar

 tref Box can describe the relationship between two track. For example: Three video track,id in a MP4 file are 2, 3, 4, and three audio track,id are 6, 7, 8 respectively. When playing track 2 video, you should use 6, 7, 8 which audio to play with. This is the time to specify in track 2 and 6 in the Tref box to bind 2 and 62. In our common MP4 file, there is almost no such situation, where is the actual application scenario? We know that iso-14496-12 is an underlying file format that derives

Tags: res size lib DSR public Sam margin track differentSame Domain: Exec sp_addlinkedserver ' PC087 ': Add Remote Server Exec sp_dropserver ' instcancename ':D elete Remote Server Sp_helpserver check already registed server at current Example of function of stored procedure name/view namesp_addlinkedserver registering a remote DB instance exec sp_addlinkedserver ' instancename 'sp_dropserver Deleting a remote DB instance exec sp_dropserver ' instancename 'sp_addlinkedsrvlogin registered Remote

shorter than a 2.5-inch HDD using 5400RPM Higher energy consumption DRAM-based solid-state disks consume more energy at any time than traditional disks, especially when powered off, or data is lost Note: In operation and maintenance work should reasonably plan the tiered storage mechanism, according to the business and data usage frequency combined with the use of Ssd+sas (15000 rpm) +sata (10000 rpm).disk-related terminology : spindle, platter, track, sector, No. 0-