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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
