To all,

For what it's worth I have been using 4GB SATA Flash Vertical Disk On Modules 
(SATADOM) in my CNC mill for a couple years without a problem.  It only has 
EMC2 and my G-code files on it.  I also have been using them on other machines 
for a shorter time period but also without problems.  For their size they are 
not cheap:  $75 for 4GB but so far they have been bullet proof and don't need a 
data cable (power only).

Jim

-----Original Message-----
From: Kent A. Reed [mailto:knbr...@erols.com]
Sent: Tuesday, January 03, 2012 6:27 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] hal taking machine down

On 1/3/2012 6:36 PM, Les Newell wrote:
> I have had some bad experiences with SSDs. So far in about 18 months I
> have killed three in my office computer and one in my network server.
> Three were Kingston V series and one was a Samsung. I had the same
> issues with all of them. Initially they worked great but after some
> months they started locking up when writing to them. After rebooting a
> chunk of the file system would be missing.
>
> I have however had no problems with CF cards. They are slow but I have
> never had a failure that couldn't be attributed to electrical or
> physical abuse. I am currently using one in my lathe (running EMC of
> course) and one in my network server. Both have been in use for a couple
> of years. You can get SATA CF card adapters if you don't have PATA on
> the motherboard.
>
> Les
>
>
> On 03/01/12 17:42, gene heskett wrote:
>> You all have said the SSD's are the way to go, so I'll probably pop for the
>> 8Gb or 16Gb version of those, but I'd need advice on brands&   models to be
>> assured of decent life.  ISTR the present install is using about 4.3Gb of a
>> 46Gb drive I've had for yonks but seems dead reliable yet.  But its a pata
>> interface that may not be available on the D525's.  Since I do daily
>> backups that's a shrug.
>
The jury still seems to be out on the question of SSD reliability,
partly because there are so few data points compared to rotating disks.

Tom's Hardware did a decent job summarizing various reports back in
July(?). There's no argument SSDs are fast but no one (except the
vendors, that is) is willing to bet on their longevity. Worse, SSDs seem
to fail without any ability to recover and they seem to without warning
(SMART seems useless as an early warning technology).

I use a cheap 30GB SSD as my boot and system device but I make sure it's
totally backed up for easy replacement when (not if) it fails.

Regards,
Kent


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