A Cruzer mystery

  • Thread starter Thread starter Bob Willard
  • Start date Start date
B

Bob Willard

I recently picked up a SanDisk Cruzer Multipack, a 3-pack of USB 2.0
Flash Drives. They work fine, although the auto-launch of ShovelWare
is somewhat annoying.

The mystery is the performance: the read STR on later blocks is
appreciably higher than on earlier blocks. Does anybody know why?

I also used this as an opportunity to compare HDtach with HDtune,
reconfirming my preference for HDtach. But both HDtach and HDtune
do support Cruzers via USB, and SD/SDHC cards via USB-SD readers.

For graphical data, see these:

- http://bobwbsgs.home.comcast.net/Cruzer2GB.gif
- http://bobwbsgs.home.comcast.net/SDHC4GB.gif
- http://bobwbsgs.home.comcast.net/Raptor74GB.gif
 
Previously Bob Willard said:
I recently picked up a SanDisk Cruzer Multipack, a 3-pack of USB 2.0
Flash Drives. They work fine, although the auto-launch of ShovelWare
is somewhat annoying.
Click to expand...
The mystery is the performance: the read STR on later blocks is
appreciably higher than on earlier blocks. Does anybody know why?
Click to expand...

I would suspect that the adressing mode and/or burst
length is changed above the 512MB mark, i.e. when adresses
exceed 20 bits. This may be entirely dure to the driver.
Do you have measurements on other USB sticks?

Arno
 
Arno said:
I would suspect that the adressing mode and/or burst
length is changed above the 512MB mark, i.e. when adresses
exceed 20 bits. This may be entirely dure to the driver.
Do you have measurements on other USB sticks?

Arno
Click to expand...

Yeah, that would explain the STR graphs for the "Red" 2GB Cruzer,
but the breakpoint for the "White" 2GB Cruzer (purchased as part of
the same 3-pack as "Red") is about 128MB. Most curious.

{I'd also test "White", but it went to school with one of the kids.}
 
Bob said:
I recently picked up a SanDisk Cruzer Multipack, a 3-pack of USB 2.0
Flash Drives. They work fine, although the auto-launch of ShovelWare
is somewhat annoying.
Click to expand...

They provide, on the Flash drive, a utility to remove the
"ShovelWare", of course...
 
Previously Bob Willard said:
Arno Wagner wrote:
Click to expand...
Yeah, that would explain the STR graphs for the "Red" 2GB Cruzer,
but the breakpoint for the "White" 2GB Cruzer (purchased as part of
the same 3-pack as "Red") is about 128MB. Most curious.
Click to expand...

And another well-known limit. I suspect these have different
controller chips in them. In that case it would actually be
a hardware issue.
{I'd also test "White", but it went to school with one of the kids.}
Click to expand...

Looking forward to more info on this mystery ;-)

Arno
 
Arno Wagner wrote in news:[email protected]
And another well-known limit.
Click to expand...

Yeah, like it's a binary number. Quite a lot of limits to go, Babblebot.
I suspect these have different controller chips in them.
Click to expand...

No, really?
In that case it would actually be a hardware issue.
Click to expand...

How about that, eh.
Looking forward to more info on this mystery ;-)
Click to expand...

It's cooked, babblebot, just like your brains.
Nothing you can do about it.
 
Back
Top