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Name: ______________________________Class _________________________ ( )Memory & Secondary Storage DevicesAmong the following devices, which are main memory and which are secondary storage devices?USB thumb drive Harddisk RAM CD-ROM ROMRAM ( ROM is another main memory)USB thumb drive Harddisk CD-ROMMain Memory: _______________________________________________________Secondary Storage:_______________________________________________________(Note 1: Main memories are memories where the CPU can directly get data from!)(Note2: A computer can have NO harddisk but RAM must exist and be working well.)Random Access MemoryRead-only MemoryRAM is short for _______________________________________________________ROM is short for _______________________________________________________Complete the following table:Read onlyWritableData and instructions still remainData and instructions will lostBasic data and programsData and programs that are to Boot-up instructions / BIOSbe processed and the resultsROMRAMWritable? (allow writing data)What happens when power is off?What is stored?What are these?Harddisk[USB] Flash disk / Thumb drive________________________________DVD discMemory cards:SD cardMini-SD cardMicro-SD card4678250-804930__________________________________4.7GB2GB 64GB1.44MB650 MB (Max 800MB)160GB 2TB1GB 64GBWhat are the common storage capacities (容量) of these? CD-ROM / CD-R / CD-RWDVD-ROM / DVD±R/RW HarddisktoMemory cardstoThumb drivetoFloppy disksMemory cards (SD/MS/…)Memory cards / DVD+-R/+-RW / HarddiskWhat type of storage could be used for the following?Mobile Phone: _______________________________________________________Digital video camera: _______________________________________________________Complete the following table: 10241048576 B 220 1024 1,000,000,000 B 230 1024 1,000,000,000,000 B 240UnitApproximate valueActual Value1 KB 1,000 B1,024 B=210B1 MB (= KB)1,000,000 B= B1 GB (= MB)1,073,741,824 B= B1 TB (= GB)1,099,511,627,776 B= B(More to learn: )Note: 1B means 1 Byte, which is equal to 8 bits (8b) ) [1B = 8b] (Note the upper and lower cases.)Now you have 1500 photos, each is 2MB size. You have a blank DVD-R and a 2G SD card.2MB * 1500 = 3000 MB = 2.93 GBDVD-R is suitableWhat is the total file size of the photos (in GB)? ______________________________________________________________________________________________________________________________________________________________Which storage media is suitable?_______________________________________________________________________________ ................
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