UV EPROM amnesia?

[stj]

Re: UV EPROM amnesia?

the convertors are on ebay.
sold for commodore64 rom swaps

[ozzy214]

Re: UV EPROM amnesia?

http://www.ebay.com/itm/231747737974...%3AMEBIDX%3AIT

Those are the drives.

It might be the psu. Im using a older gaming psu. It had bad reviews, but been watching it like a hawk.

Check with dvom and volatge holding steady at 11.9v on 12v rail and 5v on 5v rail. I personally not experience any issue. I dont know brand name and not pullig it out of ase to find out.
Silver case with silver wires..almost like a mirror.

It may be the psu, but doubt.

Its running a q8300 on a asus p5q se plus with 8gb ram 2x500gb sata drives in raid 0 and 7700 ati. Voltage is holding steady.

Plus im always hot swapping drives for testing and gaming. So really dont know why psu got bad reviews or if it was the cause.

Only bad thing is i can not overclock the system. The quad seems to be maxing the fsb out as it is and I got high end ocz oc memory in it. Cost me 125 just for the four sticks used!!

[eccerr0r]

Re: UV EPROM amnesia?

Well as they say, all bets are off when you have bad power.

So far so good - the SATA SSDs that I've had/used all have survived so far, knock on wood. I've been using SSDs for several years now and no failures yet.

Those crappy sd/microsd cards ... now those are failure prone. But I put them in their own class.

[stj]

Re: UV EPROM amnesia?

Enterprise flash drives are solid-state drives (SSD’s) that have been modified in order to meet the reliability required in an enterprise storage array. We have tested the interface: Compatible in in Standard Desktop / Laptop systems.

No tray/caddy.

All Drives have been DOD Wiped and tested; ready to install.

??

so just how many hours are on these drives?
if they have to be wiped then what was the previous use?

[eccerr0r]

Re: UV EPROM amnesia?

DoD wiping SSDs is going to take a bite out of its lifetime... Unless it's a SLC design, but I thought most SSDs are MLC even enterprise drives.

[ozzy214]

Re: UV EPROM amnesia?

??

so just how many hours are on these drives?
if they have to be wiped then what was the previous use?

According to HD Sentinal which I use religiously for all drives for resale for years, the two I had...both bought and replacement....were about 550 days of use. Believe it said they had 500 days left,.....not sure. Dont have a screenie!


But they were both perfect smart reading..100% unlike the ocz with a bad block in my lappie that is still running for months now with no issue!

It also said they had a lifetime write of like 2 terrabytes or something to that effect. Again worked fine till I power cycled.

I was going to buy two and put them in raid 0 for shits and giggles, but they kept dieing. So I gave up.

And now I found 2 120gb brand new sandisk ssd for 80 shipped.....so might go that way. But not really neccassary..more a toy. All this puter does is light gaming and hd tv and office work.

[eccerr0r]

Re: UV EPROM amnesia?

I've seen a lot of OCZ disks fail but that's just hearsay. I've never bought an OCZ disk before. I also think that 2TB lifetime writes is kind of low, I'd imagine the number should be on the order of 200TB. Probably more.

[ozzy214]

Re: UV EPROM amnesia?

I've seen a lot of OCZ disks fail but that's just hearsay. I've never bought an OCZ disk before. I also think that 2TB lifetime writes is kind of low, I'd imagine the number should be on the order of 200TB. Probably more.

The disks that I had that failed were not ocz..check the lik. They were sever class..some weird name..only corps can get. They don't seem to be available to general public although I did see somewhere on google they were rebadged ocz for server use.

check the link for tab systems I posted!

[stj]

Re: UV EPROM amnesia?

550 days of use. Believe it said they had 500 days left,.....not sure.

what the fuck!
so these things are rated for 1000days - just under 3 years???
is that warranty or expected life??????

[eccerr0r]

Re: UV EPROM amnesia?

probably the SMART field for estimated POH life left...

Yeah a lot of my drives seem to do this: it records POH and also the SMART value of 100 (or 255) when new and slowly drops to 0. When the POH value drops to 0, it will flag a SMART error... and yeah some of my drives are as low as a few years, some are many years (by calculation). The "green" and laptop drives tend to be very low, and most other desktop and SSDs tend to be high. Then again my Intel SSD reports 0 left for POH:

9 Power_On_Hours 0x0032 000 000 000 Old_age Always - 0x8edd0d000683

I don't know if this confuses any software or not, perhaps it needs to go below the threshold value and meeting it isn't enough to trigger a violation.

[fzabkar]

Re: UV EPROM amnesia?

probably wrongly programmed

These devices were used in minicomputers and workstations costing several hundred $K. Still, it's a possible explanation.

[fzabkar]

Re: UV EPROM amnesia?

the convertors are on ebay.
sold for commodore64 rom swaps

Many years ago I made my own converter for a Commodore FDD. IIRC there were 3 ROMs which I combined into a single standard EPROM using a daughter PCB. I added a few gates to handle the chip selects and enables. IIRC Commodore had two versions of these ROMs, some with active low CE and others with active high. This was to simplify bussing.

[ozzy214]

Re: UV EPROM amnesia?

Yes your right est life expectancy. I just got two 64gb crucial off of ebay for 40 shipped usd. Gonna try those in raid. Hopefully they last longer than the other ones lol

http://www.ebay.com/itm/201610706608...%3AMEBIDX%3AIT

[fzabkar]

Re: UV EPROM amnesia?

Then again my Intel SSD reports 0 left for POH:

9 Power_On_Hours 0x0032 000 000 000 Old_age Always - 0x8edd0d000683

SMART data are not always intuitive. Often the raw value will consist of two or more 16-bit or 32-bit components.

0x8edd0d000683 -> 0x8EDD 0x0D00 0x0683

I would guess that the actual number of power-on hours is more like 1667 (= 0x683).

That said, the normalised values don't make any sense to me.

[Per Hansson]

Re: UV EPROM amnesia?

Hmm thats interestign info. But okay riddle me this. If this supposed manadate is in place where the ssd cant write anymore, but data is still retrievable for up to 12 months right?

Ok why did I have two enterprise drives I bought off of ebay literally go poof on a power cycle? I mean ltieralyl smart was good, trim enabled. Was running fine. Checked with hd sentinel. Shut down system. Next day go to restart and the bios is reporting a sata port error, but still says drive is fine via smart. But I cant access under windows and linux?

This happen with 2 120gb ssd I bought of tab systems within a week!

But even more interesting is I have a ocz ssd I got off ebay dirt cheap in my lappie. Hd Sentinel reports one bad block, but that drive is runniong flawlessly for weeks now?

I think this goes against the mandate you speak of where data can be retrieved even if write cycles is up. I mean literally running perfect, next power cycle....dead. Well kinda, still could be seen. But giving a sata port error and cant be accessed...

Read the red part where I quoted myself in the previous reply again.
P.S: SMART was deviced as an early warning system for mechanical HDD's.
If you are so butthurt over SSD's failing riddle me this: I have seen hundreds of dead HDD's but never gotten a legitimate early warning from the SMART system!

As fzabkar & stj says most SSD failures are due to controller failure or firmware bug, see here for example:

Yea and I'm basing my recommendation on my own experience.
I've installed many Intel X25-M & Intel 320 drives.

All have been rock stable, but the 320 I have had to update the firmware on due to the "8MB bug". (Drive gets recognized as 8MB by BIOS and is inaccessible after power failure).

Obviously the data is still on the NAND flash, and that is what the standard mandates.
Just like the data is still on the platters of a HDD after the motor, logic board or readheads have failed.

[eccerr0r]

Re: UV EPROM amnesia?

Though I suspect it's still relevant on Flash EEPROM, I initially was wondering about UV eproms... Anyone else have stories about specifically UV EPROMs going blank or corrupt despite their windows being covered, and how old is that equipment? How about BIOS in PCs? Originally PCs had EPROMs as well for their firmware?

[stj]

Re: UV EPROM amnesia?

just to put this in context,
space invaders was made in 1979,
most of the ones i fix, the original eproms still checksum as good.
they use 2708 or 2716 btw.

i blank and reprogram them anyway - good for another 30years that way - unlike the ram!