Re: OTP Secure Digital ?

From: Paul Taylor <paul_ng_pls_rem@xxxxxxxxxxxxx>
Date: Tue, 30 Jan 2007 22:44:33 +0000

On Tue, 30 Jan 2007 14:23:19 -0800, larwe wrote:

On Jan 30, 5:20 pm, "Talal Itani" <tit...@xxxxxxxxxxx> wrote:

I am looking for SD (Secure Digital) memory that can be programmed only
once. Basically, once programmed, it cannot be erased. I searched the web,

There is no such thing.

Mass-produced removable memories like this tend to use mask ROM. If
they resemble SD it's only cosmetically. Such devices have a vested
interest in NOT using a simple-to-duplicate storage format where blank
media are available off the shelf.

Multimedia cards have a permanent write flag in the CSD register. I
have not tried this feature but from a data *** I have, it permanently
disables erases + writes. Not sure if SD card has the same functionality -
I don't have a technical spec for one of those.

Regards,

Paul.

.

References:
- Re: OTP Secure Digital ?
  - From: larwe

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