[Coco] working with the sdc

[rietveld rietveld]

Taking a 2GB card and writing it beginning to end over and over again averages about 10TB before the card is dead and no longer is writable.

Quoting the SD card product manual: "1.9 Wear Leveling. Wear leveling is an intrinsic part of the erase pooling functionality of the SD Card, using NAND memory." 


Sent from my BlackBerry
  Original Message
From: Dave Philipsen
Sent: Monday, November 5, 2018 8:43 PM
To: CoCoList for Color Computer Enthusiasts
Reply To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] working with the sdc


For what it’s worth, I think most SD cards also employ some sort of wear leveling.

I’ll see if I can pdf the pages for you.

Dave

> On Nov 5, 2018, at 2:15 PM, Gene Heskett <gheskett at shentel.net> wrote:
>
>> On Monday 05 November 2018 12:51:06 Dave Philipsen wrote:
>>
>> There is a way to boot OS9 directly without using DW. Alan Huffman has
>> a nice discussion on it here:
>> http://subethasoftware.com/2015/02/02/manually-making-a-bootable-nitro
>> s9-hard-drive-image-part-1/
>>
>> Dave
>
> That series of articles can be very helpfull.  But would be far more
> helpfull if compiled into a printable pdf I could take to the machine
> for handy reference. Bookmarked FFR of course.
>
> Now what I need is to write a size adder so I can figure out just how
> much data actually lives on these seagates, as I was useing about 110
> megabytes of that maxtor 7120s. Theres also 256 35 track SS vdisks
> liveing in the top of the nominally 480 megs formatted with a cluster
> size of 4 formatting. Details to work out obviously.  If this series of
> web pages can be merged into a pdf, it would sure save these old wore
> out legs a lot of trips down, and back up a flight of stairs.
>
> Thanks to Allen for writing it up as a web blog.
>>
>>>


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