The first computer ENIAC
On February 14, 1946 developed

The university of Pennsylvania,
Molly's military aid $1.5 million

First computer fault more

Time node components
The first generation of 46-58 tube
The second generation of 58-64 transistor
The third generation integrated circuit, 64-71
Fourth generation since 71 - very large scale integrated circuit
Going forward to the fifth or sixth generation

The computer five parts
1. Enter
Output
2.3. Operation
4.
control5. Storage

Input devices
Keyboard classification
Standard
1.2.
human body engineering
Interface type
PS/2 (curved) green purple key mouse (now is common interface is purple half half is green)
Benefits strong compatibility does not support plug and play
2. USB (square opening)
Advantages disadvantages compatibility support plug and play not as good as a PS/2
Wireless
3.Advantages, free of line faults without the host power supply need to be replaced periodically battery


The commonly used shortcut
Copy the CTRL + c
Shear CTRL + x
Paste the CTRL + v
All CTRL + a
Save the CTRL + s

Quick switch to the desktop win win + m + d
Open search win + f
Open the resource manager win + e
Lock your computer quickly win + L


The mouse
1. Mechanical mouse (out)
Optical mouse
2.
Input devices
Keyboard
1.2. The mouse
3. The camera
4. The scanner
5. Tablet
6. The microphone

Output devices
1. The CRT display
Disadvantages: large volume of local
Advantages: large visual Angle has no bad points colorful extremely short 1-2 ms response time
1 s=1000 ms

2. LCD
A. CD LCD
B.L ED LCD
The advantages and disadvantages and CRT instead

Displays the size of the calculation is calculated according to the diagonal unit is inch
1 inch=2.54 cm

The display interface type
1. The VGA
2. DVI
3. The HDMI
4. Dispaly - port

Printer
Classification
1. The stylus printer (consumables: ribbon (belt) carbon ribbon)
The main printing paper
2 3 coupon... 6 al
Interface: LPT USB
Printing speed
1-2 pages per minute
Brand: epson reflected the OKI HP lenovo

2. Inkjet printer supplies (: ink cartridges)
To print documents main picture
A3 paper A4
Interface: USB
Support network (wireless cable)
In the print speed
5-6 pages per minute
Brand: HP lenovo brother

(3. Laser printer consumables: toner cartridge again)
The main print documents
A3 paper A4
Interface: USB
Support network (wireless cable)
Printing speed
More than 30 to 50 pages per minute
Brand: ricoh HP lenovo brothers lexmark panasonic

Interface type
1. The LPT (parallel)
2. USB
3. So
Wireless
4.
Printer
What's the difference between the support network and does not support network?
If you don't support network function, printers need to have the support of computer to print,
If there is no Shared, only the current computer print
If the Shared, other computer after adding the printer can print,
If the current computer shut down, the rest of the computer can't print,

Support network function, the printer doesn't need the support of computer, also can print, normal (network)
As long as the network is normal, computer have to add a printer, it can print,
Networks such as is not normal, not be able to connect to the printer, can't print,

How to add a network printer?
1. By sharing
Search for Shared hosting IP add
2. Support network
Find the printer IP add

Output devices
1. Display
2. Printer
3. The speaker

Store
1. The store (temporary storage)
2. The storage (permanent storage)

Store
1. The RAM random dynamic storage (to)
2. ROM ROM (read only)
3. The CACHE CACHE (to)

Difference:
What's the difference between the RAM and ROM?
RAM data is lost when the power is cut off,
ROM data is not lost when the power is cut off,
Large capacity of RAM speed slow (compared with CPU CACHE for slow much faster than the hard disk)
Fast small CACHE capacity (compared with RAM fast)

Fastest CPU
The second is the CACHE
The third is the RAM

CACHE
Minimum level cache capacity fastest
Level 2 cache capacity middle speed center (slower than level 1 cache is faster than level 3 cache)
Three levels of cache capacity maximum speed of the slowest

RAM working frequency
SDRAM stitch count 168 voltage of 3.3 V 133 266 MHZ
DDR stitch count 184 voltage of 2.5 V 400 533 MHZ
DDRII stitch count 240 voltage of 1.8 V 667 800 MHZ
DDRIII stitch count 240 voltage of 1.5 V, 1066, 1333, 1600 1866 MHZ
DDRIIII stitch count voltage of 1.2 V 2133 2666 2400 3000 3200 288

CTRL + shift + esc quickly popup task manager
- find performance TAB in task manager - find a resource manager can view memory usage, memory

Outside the store

1. The hard disk2. Removable storage
3. The CD

Hard drive
1. Mechanical hard disk
2. Solid state drives
3. The hybrid drive

Mechanical drive
Advantages: cheap large capacity
Disadvantages: slower

Solid-state drives
Advantages: fast
Disadvantages: expensive small capacity

Hybrid drive
Part (big) (small) part of the solid mechanical
The advantages and disadvantages: between

Interface type
1. The IDE (usually used for personal computer) (out)
2. The SATA (usually used for personal computer)
3. The SAS (often used in server)
4. SCSI (often used in server)

IDE top speed of 130 MB/s

SATA 1.0 2.0 3.0 (currently in use)
1.0 top speed of 150 MB/s
2.0 top speed of 300 MB/s
3.0 top speed of 600 MB/s

SAS SCSI top speed of 1200 MB/s

Speed
IDE 5400 r/min
SATA 7200 r/min
SAS 10 or 15 k k/min
SCSI 10 or 15 k k/min
Why so fast?
Because the vacuum environment is inside hard disk


Check the disk information
Right-click the computer - management - selection device manager - select disk drive
WD brand is western data
10 capacity of 1 TB
The most commonly used brand and Seagate
Have commonly used brand Hitachi maxtor
Intel SSD brand samsung sandisk etc.

Check the disk management information
Right-click the computer - the choice management - storage - select disk management

Disk 0 under Windows are used to represent the first disk
Under the Windows used to represent the second disk disk 1
So on

C D E... On behalf of the partition (each partition should have symbols)
Partition
1. The primary partition (each hard drive there can be up to four primary partitions)
(stored data, installation system)
2. The extended partition (can be divided into logical partitions, takes up a primary partition number)
(only logical partitions, cannot be directly stored data)
3. The logical partitions (stored data)

Why under the Windows partition C drive start?
Because A and B are assigned to floppy disk (floppy disks)
So hard disk (disk) is a C start

Under Windows logical partition can have countless
But, because each partition needs a plate of symbols to normal access (using)
Can more than from A to Z so under Windows 26 partitions (including primary partitions and logical partitions)
The default disk drive is C, A and B as long as is not use floppy disk (floppy disks), can be assigned to A disk

Disk partitioning, formatting such as knowledge, when installation system,


Note
Mechanical drive precision parts most afraid of vibration
SSD aseismatic ability better than mechanical

Hard disk function (stored data)
Yan ji:
The hard disk of valuable data priceless


File delete points two
1. Delete (after the recycle bin)
2. Delete (without the recycle bin)

Delete the files to the recycle bin reduction
Delete the file cannot be completely by the recycle bin reduction, need to use data recovery tool

The disk is divided into two parts of the physical and logical
The logical part of
1. Track the disk is divided into a number of concentric circles of the logic
2. The sector could be divided into several logical disk sector
3. Different track same sector is a cylindrical cylinder

Disk to distinguish which place has the data, where no data
The sector do logo

Identity can be divided into two kinds of
1. Write
2. Do not write

There is no data to write on behalf of the area, can write data to the
Except in the case of a
When we delete the data on the disk, the actual data is still in the disk
Only to make the region identification, identified as writable

So delete data, there is a big may be recovered,
After data is deleted, note
1. Stop all operations of the equipment (including reading and writing)
2. If not delete themselves, to the operation people understand the real situation
3. Choose the appropriate recovery tool for recovery
4. Restore recovery times will also increase the difficulty
5. Don't do other work during the process of recovery
6. Avoid power
7. Data recovery is not preferences (no), at ordinary times should strengthen the data backup

After the equipment is formatted, note
1. Ditto
2. The format of equipment, need to know the equipment before the file system format

Under the Windows
The file system format has
FAT
1.2. The FAT32
3. The NTFS file system format (latest)

CD
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