SanDisk SD064 Manual descarregar pdf (Página 21)

3.6 Microdrive

-ICRODRIVE IS BASICALLY A HARD DISK DESIGNED TO lT INTO A 4YPE )) #& CARD SIZE ENCLOSURE

!LTHOUGH THE SIZE OF A MICRODRIVE IS SAME AS THAT OF A #& CARD ITS POWER CONSUMPTION IS

MUCH HIGHER THAN mASH MEMORIES AND THEREFORE CANNOT BE USED IN LOWPOWER APPLICATIONS

4HE CAPACITY OF MICRODRIVES IS  '" OR MORE &IGURE  SHOWS A TYPICAL MICRODRIVE

4HE PHYSICAL DIMENSIONS OF MICRODRIVES ARE  s  s  MM AND THEY WEIGH

APPROXIMATELY  G 4HE lRST MICRODRIVE WAS DEVELOPED BY )"- IN  WITH A CAPACITY OF

 AND  -" 3OON AFTER THE CAPACITY WAS INCREASED TO GREATER THAN  '" IN THE YEAR 

BY (ITACHI -ICRODRIVES WITH A CAPACITY OF  '" WERE INTRODUCED IN  BY (ITACHI AND

3EAGATE

4HE ADVANTAGE OF MICRODRIVES IS THAT THEY ALLOW MORE WRITE CYCLES THAN THE MEMORY CARDS

)N ADDITION MICRODRIVES ARE BETTER AT HANDLING POWER LOSS IN THE MIDDLE OF WRITING /NE OF THE

DISADVANTAGES OF MICRODRIVES IS THAT THEY DO NOT SURVIVE IF DROPPED FROM A HEIGHT OF  M

)N ADDITION THEIR TRANSFER SPEEDS ARE AROUND  -"S WHICH IS LOWER THAN MOST OF THE PRESENT

DAY HIGHEND MEMORY CARDS )N ADDITION THEY ARE NOT DESIGNED TO OPERATE AT HIGH ALTITUDES

AND THEIR POWER CONSUMPTION IS HIGH COMPARED WITH MEMORY CARDS

3.7 xD Card

X$ STANDS FOR ExTREME DIGITAL AND THESE CARDS ARE MAINLY USED IN DIGITAL CAMERAS DIGITAL

VOICE RECORDERS AND -0 PLAYERS X$ CARDS WERE DEVELOPED BY /LYMPUS AND &UJIlLM IN

 AND THEN MANUFACTURED BY 4OSHIBA #ORPORATION AND 3AMSUNG %LECTRONICS &IGURE 

IS A PICTURE OF A TYPICAL X$ CARD X$ CARDS ARE AVAILABLE IN THREE TYPES 4YPE - 4YPE ( AND

Type M

Figure 3.5: Microdrive

Figure 3.6: xD Card

112 Chapter 3

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