Age Old question -- SD card vs internal memory

eGeezer · 01-02-2010, 04:27 PM

Cuz this was addressed in a couple other threads, but isn't strictly on topic for any of them, I thought I'd just stick the results of my little experiment out here.

Should we use the SD card or internal memory. Which is faster? Why one over the other?

Lots of theories there, but I didn't see actual figures, so...

Hooked up my Astak PPro via the USB cable, dragged and dropped the Astak "500+ Free eBooks" folder (about 250m) from my computer to the internal memory, then to the SD card, deleted both, then stuck the SD card in a card reader and did the same.

USB cable 250m file folder:

To int mem = 6 minutes. Delete same, 2 minutes.

To SD card = 3 minutes. Delete same, 20 sec.

SD Card in card reader:

To SD card = 1 min 20 sec. Delete same, 15 sec.

Hope it helps some. Naturally, results will vary depending on each person's equipment.

theducks · 01-02-2010, 04:46 PM

What I don't understand is the long delete times on the PEz?
Delete is really a "Mark Deleted/ space is Available" or a Move (the directory entry) to the trash folder (one for each storage device).

The file should not change position in the Flash, therefore only take seconds to re-write the directory entry and FAT table
Your times in the Card Reader are what I expected.

Dave_S · 01-02-2010, 05:57 PM

Quote:

Originally Posted by theducks

What I don't understand is the long delete times on the PEz?
Delete is really a "Mark Deleted/ space is Available" or a Move (the directory entry) to the trash folder (one for each storage device).

The file should not change position in the Flash, therefore only take seconds to re-write the directory entry and FAT table

what you describe is the way MS does it in Windows, and that is fine for magnetic disks. However, since a NAND FLASH allocation block cannot be rewritten until it is truely erased, maybe Jinke is doing an actual erase when files are deleted? That would improve write speeds when the blocks are later reused.

01-02-2010, 04:27 PM	#1
eGeezer NE1 seen my glasses? Posts: 395 Karma: 4864 Join Date: Oct 2009 Location: Seattle Device: Nook Touch (90%) - iPad (After Lights Out) - Broken Blue Astak PPro	Age Old question -- SD card vs internal memory Cuz this was addressed in a couple other threads, but isn't strictly on topic for any of them, I thought I'd just stick the results of my little experiment out here. Should we use the SD card or internal memory. Which is faster? Why one over the other? Lots of theories there, but I didn't see actual figures, so... Hooked up my Astak PPro via the USB cable, dragged and dropped the Astak "500+ Free eBooks" folder (about 250m) from my computer to the internal memory, then to the SD card, deleted both, then stuck the SD card in a card reader and did the same. USB cable 250m file folder: To int mem = 6 minutes. Delete same, 2 minutes. To SD card = 3 minutes. Delete same, 20 sec. SD Card in card reader: To SD card = 1 min 20 sec. Delete same, 15 sec. Hope it helps some. Naturally, results will vary depending on each person's equipment. __________________ Fame is fleeting, but obscurity just drags on and on... -- Frank and Ernest comic strip Sep 2010

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01-02-2010, 04:46 PM	#2
theducks Staff to 4 Cats Posts: 10,697 Karma: 2485850 Join Date: Aug 2009 Location: The (original) Silicon Valley, USA Device: Galaxy Tab 2,Black Astak PEz, K4NT(now Wifes)	What I don't understand is the long delete times on the PEz? Delete is really a "Mark Deleted/ space is Available" or a Move (the directory entry) to the trash folder (one for each storage device). The file should not change position in the Flash, therefore only take seconds to re-write the directory entry and FAT table Your times in the Card Reader are what I expected.


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