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Technology Stocks : WDC/Sandisk Corporation -- Ignore unavailable to you. Want to Upgrade?

To: Ausdauer who wrote (24374)	12/19/2003 3:02:34 PM
From: Bruno Cipolla	Read Replies (3) \| Respond to of 60323

AUs re: calculations those are real, measured data rates. Mpeg2 can run from 2 Mbps to more than 10 Mpeg4 from about 50kbps to more than 4Mbps a typical DVD movie is 8 to 10 Mbps a typical Divx Movie is 800Kbps to 1.2 Mbps I insist that most of the Write speed hype is just hype, that is when Mpeg realtime encoding will be available at decent resolution (VGA+) and affordable prices write speed will matter only for Hi end burst mode digital cameras. My 12MP Fuji does VGA 30FPS video with sound, but it produces Mjpeg video and it eats Flash (wow!) As i have several old and less old CF cards i will let you know which work and which don't with my camera. B. P.s. about the Panasonic SD at 6MB/sec you pointed to... "Downside: The SD cards turn out to be not so convenient after all; you must use Panasonic's media to shoot the highest-quality video because the encoding requires the 6MB-per-second performance that only the company's own cards can achieve. Plus, current SD capacities top out at 512MB, which can accommodate a mere 10 minutes of highest-quality video. You'll have to wait until well into 2004 for the debut of 1GB cards" 1) 512MB capacity at 6MB/SEC (is it sustained?) is 88 seconds of video, not 10 minutes. 2) Not even DV tape runs at more than 25-28Mbps 3) Panasonic (and everybody else) wants us to buy their cards. That reminds me of 8X 12X 24X... 52X digital optical media (blank CDs) (i've just burned a 2X CD on my 40X burner and it works) it also reminds me of 52X CD readers where the 52X is only in "best case" and actual performance is much lower. Write speed may vary mucho depending on size of the writes I.E. if you write 1MB 1 block (512 Bytes) at a time or in say 32KB blocks you do about 2K writes in the first case and only 30 writes in the second case. As the flash card controller has to be involved for every write operation it may turn out that (as it happens to Hard disks) the total time for the 1MB write operation is much different. Another factr that can speed up very much the space allocation and disk write operation is the size of the flash memory Cluster and even "sector" Over time going from 120MB hard disks to the current 120GB disks i switched from a 512Bytes/sector 1 sector per cluster to 4KB/sector 256KB(64sectors)/cluster (i do mostly video and huge clusters are very ok to me) As file size increases (nowadays a photo is 1-3 MB and a video much more) sticking to small cluster sizes is counterproductive. FAT32 supports large clusters (up to 32KB) depending on disk size. storagereview.com B.