Re: [ts-7000] Microdrive / Type II CF?

["Don W. Carr" <>]

I think it is important to use a flash file system to distribute the
writes. That is why we have projects such as YAFFS for instance.

http://en.wikipedia.org/wiki/YAFFS

Here is another entry that explains why ext2 is not good for flash file systems:

http://en.wikipedia.org/wiki/JFFS
http://en.wikipedia.org/wiki/JFFS2

I have two PC/104 battery backed ram modules I will probably not use
because they are so bulky, only hold 2 meg, and 2 Gig SD flash is so
cheap and so small. But, if you were really worried, you could do all
of your logging to battery backed ram, then copy only complete blocks
to the flash card. 

We need to create a HOWTO for doing datalogging to flash memory. Even
if you had to buy new SD cards every five years, it might still be
cheaper and more reliable than purchasing a mini hard drive.

Don.

On 5/29/06, Andrew Lees <> wrote:

Mark Carlson wrote:

Hello all,

I currently have a TS7200 and was wondering if anyone has used a
Microdrive or anything similar with it.  I know the Microdrives are
Type II CF, so will they fit? (I'm a newbie when it comes to that sort
of thing.)

Here is a link to a Hitachi Microdrive I am considering getting:
http://www.amazon.com/gp/product/B0006ZSUHY/104-6667107-8921500?v=glance&n=172282
http://tinyurl.com/lt5s3 (tinyurl'd in case the original gets broken up)

The only reason I am considering getting a Microdrive is becuase I'm
going to be doing a lot of logging during development and I don't want
to burn out my CF disks very often.  I might just end up doing the
logging over NFS, but I would appreciate responses from people who
have used a small hard drive with this board.

-Mark

Mark,

It might depend on the CF socket installed on the board.  I could not install a microdrive on a board I have here because of the socket.  It just wouldn't fit. Electricaly it should be compatible.

Ext2 is probably ok, the wear leveling should occur in the hardware, I believe. Someone please correct me on this if they know better!  Just make sure you mount the file system with the "noatime" option.  Also you might put your logging on a different file system/partition than the rest of the system, then you can make parts of the system read only, and avoid power down issues.

I have used the minix file system (low disc space overhead) for small partitions and ext2 for larger ones. I wonder if anyone has any suggestions for the best choice on CF cards?

Andrew

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Dr. Don W. Carr
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