[lug] USB3 vs eSATA III question
zlynx at acm.org
Sun Jul 22 15:16:36 MDT 2018
On 7/22/2018 12:27 PM, Bear Giles wrote:
> I don't think any USB stick is going to be pushing 3 Gbps (but I'm not
> 100% certain), but perhaps an external hard drive, esp. an external SSD.
> But is that actually realistic?
I bought one of these Sandisk USB 3 SSDs and it does over 400 MB/s.
That's 3,200 Mbps.
> In contrast my experience with eSATA is that it really is akin a
> traditionally installed disk.
Yes. eSATA is nothing special. It's a SATA cable with some extra
shielding. And I think it's supposed to provide power, but I've never
used an eSATA drive that relied on it. All of them had their own power
> Like I said this is mostly from curiosity. I noticed my recent systems
> haven't had eSATA ports but it's easy to add a half-height card for one.
> Ditto external drives - they usually only have USB 3 but if you buy an
> external drive case for your own drive then it's easy to find them with
> both USB 3 and eSATA. So I have my eSATA gear but it might not be
> necessary any longer if the quoted USB 3 numbers are accurate.
> Does anyone else have experience with both USB 3 and eSATA?
I had a USB drive enclosure for four SATA drives. It was bad. I blame
the JMicron controller. It couldn't run the drives inside at anything
close to full speed even though it should have had plenty of USB bandwidth.
I use eSATA on one of my external backup drives. It performs just the
same as internal SATA. No difference. But it isn't like a hard drive
needs 6 Gbps. Only SSDs go that fast.
> (Meanwhile I'm wondering what to do with a few old external drives that
> are USB 2. They're so much slower and smaller than my external USB 3
Backup drives don't need to be that fast usually. They'll work just fine
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