CHAPTER 7 Storage 6.ppt

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1、CHAPTER7StoragePCCardsDiskDrivevs.FlashMemoryRead/Write(+)Lostcostperbit(-)Mechanicalmovement(SPM&VCM)(-)Highpowerconsumption(10-15W)(-)HeavyweightcomparedtoflashRead/Program/Erase(+)RandomAccess(+)Non-volatile(+)LowPowerConsumption(2W)(-)ErasebeforeWrite(-)Erasingop

2、erationintheunitofblock(notpage)(-)Maximum#oferaseoperationspercell(-)Highcostperbit2HistoryofFlashMemory3NANDFlashMemory–Program/EraseF-NtunnelingGiveahighervoltageandelectronsaretrappedthroughgateintofloatinggatetransistor.4FlashMemoryComparisonNOR(CodeExecutablein

3、PlacelikeMemory)FastreadandslowwriteNAND(Data-storage)FastwriteandlowercostFlashTypePerformanceApplicationCodeStorageNOR-Intel/Sharp-AMD/Fujitsu/ToshibaImportant:-HighRandomAccess-ByteProgrammingAcceptable:-SlowProgramming-SlowErasingProgramStorageCellularPhoneDVD,Se

4、tTOPBoxforBIOSFileStorageNAND-Samsung/ThoshibaImportant:-HighSpedProgramming-HighSpeedErasing-HighSpeedSerialReadAcceptable:-SlowRandomAccessSmallformfactor-DigitalStillCameraSiliconAudio,PDAMassstorageasSiliconDisk-Drive5NANDFlashNon-VolatileFlashCardsVariousStandar

5、dMemoryCards6FunctionalBlockDiagramforSAMSUNGK9K8G08U0MNANDFlash7NANDFlashTechnology8ComparisonforDifferentMemoryTypes9HybridHardDisk(HDD)Seagate’sReadyDriveHDDPrototypeofSamsung&SeagateforLabtop(WinHECconf.2006)128MBNANDFlashMemoryinharddiskStorefrequentlyaccessedse

6、ctorsofdataforquickreads(e.g.,FATtable)Flashisusedtomakelessfrequentdiskpowerdownandup.AdvantagesReliability,Power-Efficient,andImprovedPerformanceExperimentRunOfficeApplicationsSpunupeverythreeandfourminutes10%powersaving10Seagate’s5400RPMHybridHardDrive160GBofregu

7、larperpendicular(PMR)space256KBflashmemoryItisforWindowsVistainQ12007.11