[ale] Linux alternative recommendation ?
courtneycthomas at bellsouth.net
Tue Oct 25 10:01:36 EDT 2011
Much gratitude for stayin' with me on this, and the summary as well.
On 10/24/2011 5:05 PM, Ron Frazier wrote:
> <disclaimer ON>
> I'll be glad to give you my opinion. Opinions are plentiful and
> cheap. Your mileage may vary.
> I am not a physicist, and am not an expert on flash memory technology.
> <disclaimer OFF>
> OK. An SSD is a giant version of a memory stick, more or less. The
> same pros and cons as mentioned before apply. I cannot speak to the
> susceptibility to airport screening equipment as mentioned in my other
> post. I love the idea of an SSD, although I don't currently own one.
> Properly configured and properly supported by the operating system,
> they are blazing fast. One big current problem is cost, so you have
> to determine if it's worth $ 2 / GB to get one, as opposed to $ 0.10 /
> GB for HDD. As someone else said, you probably won't get much speed
> advantage over an external HDD when connected to a USB v2 port.
> According to Wikipedia, USB v2 is capable of 480 Mbit/s (60 MB/s).
> That's the most you'll get out of any device connected to a USB v2
> port. The SATA port on either a HDD or SSD is capable of about 6X
> that speed. So, the bottleneck is going to be the USB port. I don't
> know for certain, but I suspect that either the SSD or HDD will
> perform similarly when connected to a USB v2 port. The HDD will be
> faster, and the SSD will be WAY faster, when connected to an internal
> SATA port on the PC.
> I tried an experiment by copying 20 Ubuntu ISO files (about 13 GB)
> from one internal 7200 RPM SATA drive to another in my PC. Data
> transfer speed varied widely, which may be due to the two platters not
> being synchronized. In any case, the max consistent speed was about
> 50 MB / sec. So, I don't know if a 7200 RPM drive can max out a USB
> v2 connection, but it will come close. A 10,000 RPM drive could
> probably exceed the limits of a USB v2 connection. They are available
> in 2.5", but cost a bit more.. An SSD will almost certainly max out
> the USB v2 connection.
> So, the bottom line is this. The SSD is probably better for your use
> as an external drive IF A) you want to pony up the money, and B) you
> convince yourself that airport scanners won't fry it. It won't be
> much faster than a HDD if on USB, but it will be very durable and
> pretty much immune to mechanical shock (don't run over it with a big
> truck). It will be mostly immune to electrical shock if properly
> enclosed (don't intentionally make sparks to it). Get one with a 5
> year + warranty.
> If you're convinced that airport scanners will fry flash memory, go
> with a g-shock protected (as someone mentioned) NON HYBRID HDD with
> 7200 RPM speed. If you want maximum possible speed, go with 10,000
> RPM. I didn't think about the airport thing when I originally
> mentioned the hybrid drive. For that matter, I don't know how airport
> scanners effect HDD's either, but I presume, not so much. The HDD
> will still be more susceptible to mechanical damage than an SSD, so
> g-shock feature notwithstanding, try not to smack the drive,
> especially while it's running. Again, get one with a 5 year + warranty.
> As I mentioned in another post, I have misgivings about the long term
> reliability of any flash memory device, including SSD's. No matter
> what you choose, you need regular backups of critical data. Perhaps
> even more so with a flash memory device. Over the last few years,
> I've observed failures in several types of flash memory devices as
> a) when I was teaching, students reporting that their files vanished
> or were not accessible on memory sticks
> b) my own relative's inability to access photos on a memory card,
> which I had to recover
> c) a GPS device that suddenly decided it didn't want to run it's
> program properly, and didn't want to take a firmware update
> d) routers that, periodically, start getting flaky, and have to have
> their firmware reloaded
> e) some may call me crazy for mentioning this, but, severe solar
> storms are predicted in 2012 and beyond, which MAY be more likely to
> disrupt flash devices (I'm not an astronomer either.)
> All these devices (a - d) are flash memory based. And, I've seen them
> all flake out. I wouldn't probably want to backup an SSD to an SSD.
> I'd back it up to an HDD, and possibly to online backup too.
> So, there you have it, long answer to short question. As with many
> things in technology, the answer is "it depends" on your use case.
> Hope it helps.
> On 10/24/2011 3:14 PM, Courtney Thomas wrote:
>> What is your take on SSDs vs HDDs ?
>> Thanks again,
>> On 10/24/2011 1:47 PM, Ron Frazier wrote:
>>> There are a couple of benefits to "rolling your own" external
>>> drive. It is frequently the case that the prefab drive in a case
>>> type of packages don't have adequate cooling. While the compact DIY
>>> enclosures for 2.5" drives usually don't have fans inside, good ones
>>> are made of aluminum, which has good heat dissipation. Bigger
>>> enclosures sometimes have fans. Western Digital had problems a few
>>> years ago with their packaged drive in a case (my book, passbook,
>>> whatever it's called). The drives would fry themselves to death.
>>> Then you have to fret with RMAing the thing. If you open the case,
>>> you void the warranty, and I don't think they had a 5 year
>>> warranty. If you choose carefully, you can get a bare HDD with a 5
>>> year warranty. Then you can switch it in and out of cases as you
>>> see fit. You can also upgrade it to a larger drive if you choose,
>>> and not worry about voiding the warranty.
> (PS - If you email me and don't get a quick response, you might want to
> call on the phone. I get about 300 emails per day from alternate energy
> mailing lists and such. I don't always see new messages very quickly.)
> Ron Frazier
> 770-205-9422 (O) Leave a message.
> linuxdude AT c3energy.com
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