So ... don't delete it ... it is only a tiny 300MB or so partition just for the boot loader.
Well, you CAN and you MUST delete the Windows partition on internal disk after you copying it to your external disk, because only 1 Windows partition is allowed to be booted. What I mean is that if you install Windows directly to your external disk following that thread, https://forums.macrumors.com/threads/1508618/, you will have to keep a small NTFS partition on your internal disk, which contains some important booting files while the majority of your Windows OS files were installed onto your external disk. If you delete that small partition, your Windows won't work anymore.
As several others have stated, your Thunderbolt Black Magic Disk Speed Test results (and real world experience) will vary widely depending on which Thunderbolt adapter you use, which SSD, etc..
I, Hfg and William G. all have posted test results with good results.
One issue is that you're using a bus-powered TB device, they're generally not as fast; there's testing out there, and even an article on how to rig an external power supply.
Another issue is that you're using the particular enclosure you have...IIRC, it isn't the fastest one of the current crop (I could be wrong, it could just be the bus-power thing).
The best results I seem to recall (other than the rather expensive OWC external PCIE bus/blade SSD solution) were from the Promise J4 (has issues with new iMac 2012; won't work in Windows at this time so I sent it back) and from the Seagate Desktop Backup Plus. I'm using the Seagate with a 500 Gb Samsung 840, split in half for OSX ML/Bootcamp Win7 64 bit, and it's a crazy fast setup. Photoshop CS6 64 bit opens in around 1-1.5 seconds on both Mac and Windows. I'm happy with my decision to go with a 1TB internal HDD and go external SSD with my 2012 iMac. This is an iMac forum, yes?
How would I know what to keep and what to delete?
Can you post a benchmark (Blackmagic or AS SSD) of your setup? I want to have a look at how fast does the 840 work with a Seagate desktop adapter. Many thanks.
I have the Samsung 830 256GB in a Seagate Backup Plus Thunderbolt enclosure 2.5" (not the Go Flex, which is the older model), and Blackmagic reports ~320MB/s writes and ~365MB/s reads. It's blazing fast for my needs, and OS X loads before I can blink.
Benchmarks are just silly 99.9% of the time, they really are. Does basically every application open in less than a second? Yes. That's all I care about.
Yeah I know benchmarks are silly Just curious ho...
Well, there's some results for you, then. I absolutely understand people who want 60fps in games vs 45-50fps. 100%. But the SSD benches are just out of control. I've used some ridiculously fast SSD RAID arrays, and I honestly can't tell the difference EXCEPT when doing huge file transfers from SSD to SSD, which happens so infrequently.
I don't know.. the hysteria is a bit mental. The funny thing is that there's still this obsession with SSD speed. MOAR SPEED! Except the obsession at this point, in my ever-so humble opinion, should be FORGET the speed, and concentrate on bringing the price of these SSDs down. Stop trying to get more speed out of SSDs, manufacturers! LOWER the speed if necessary. I'd be perfectly happy with ~200MB/s read/writes with those wonderful SSD low access times and 4K speeds, but with larger capacities for less money.
How has this not happened more quickly?
I don't care about sequential throughput, either. I just want to see the 4K speed using different enclosures. OK, you are right, it's meaningless and sometimes silly. I should forget about benchmarks and enjoy my new iMac with SSD now.
Good news(?) is manufacturers have stopped trying to get top speeds. Their focus now is on reducing $ per GB. With the adoption of TLC flash and advances in photolithography (1x nm in 2013), costs will definitely drop a lot. Yet speed and endurance will be the major problems...
Well here's my xbench 1.2 results from the Samsung 830 256GB in Seagate Backup Plus Thunderbolt enclosure connected to my 27" 2012 iMac. It's my boot drive. No idea how accurate it is. Like I said, Blackmagic reports 365MB/325MB read/write speeds (which, as mentioned, doesn't tell the whole story).
Results 476.67
System Info
Xbench Version 1.3
System Version 10.8.2 (12C2037)
Physical RAM 32768 MB
Model iMac13,2
Drive Type SAMSUNG SSD 830 Series
Disk Test 476.67
Sequential 309.42
Uncached Write 548.10 336.52 MB/sec [4K blocks]
Uncached Write 472.56 267.38 MB/sec [256K blocks]
Uncached Read 134.51 39.36 MB/sec [4K blocks]
Uncached Read 644.26 323.80 MB/sec [256K blocks]
Random 1037.43
Uncached Write 1073.98 113.69 MB/sec [4K blocks]
Uncached Write 700.08 224.12 MB/sec [256K blocks]
Uncached Read 2231.24 15.81 MB/sec [4K blocks]
Uncached Read 954.22 177.06 MB/sec [256K blocks]
As several others have stated, your Thunderbolt Black Magic Disk Speed Test results (and real world experience) will vary widely depending on which Thunderbolt adapter you use, which SSD, etc..
I, Hfg and William G. all have posted test results with good results.
One issue is that you're using a bus-powered TB device, they're generally not as fast; there's testing out there, and even an article on how to rig an external power supply.
For comparison, below is an Intel 520 series 180gb SSD, running in a Plugable "lay flat" USB3 dock:
(http://www.amazon.com/dp/B00APP6694...=2025&creative=165953&creativeASIN=B00APP6694)
Very happy that I didn't spend 'way more than necessary for a Thunderbolt enclosure. Once the "early adoption bugs" are straightened out, USB3 is going to become the preferred choice over Thunderbolt, a few niche utilizations notwithstanding.
Or get a Fusion drive, and a 1TB external SSD for your Media...
wmy5, I was just wondering if you could still use parallels with the external installation via this method. I've got my 3TB fusion iMac ordered, and am trying to figure out the best way to get bootcamp on a fast drive! Most of the time I'll probably boot into bootcamp if I need to use Windows, but I really need the ability to quickly get into windows and access it via parallels as well. Thanks in advance!
Sorry to be a necro but seagate has the TB adapter for $49 right now on site, I'm not affiliated with them I just ordered one to do the same thing you guys have done - boot from external samsung ssd 840 pro via seagate thunderbolt. Just thought some might like to know if they have been on fence about getting one like I was.
What speed are you seeing in BlackMagic ?
What speed are you seeing in BlackMagic ?