Getting new ssd today to test. My sandisk extreme 120g might be the culprit. But read somewhere about a guy who used wd 7200rpm 2.5 hdd to capture dnxhd 720p from camera
Found these info on dvinfo.com forum:
BMD Hyperdeck FAQs:
The following SSD's are (re)commended for uncompressed video capture:
1.OCZ 240GB Vertex 3
2.OCZ 480GB Vertex 3
3.Crucial 256GB C300
4.Kingston 64GB SSDNow V+
5.Kingston 128GB SSDNow V+
OLD VS NEW
There may be good reasons for using older SSD's with Toshiba T6UG1XBG controllers as they have always on garbage collection that gets around the lack of OS TRIM support of the shuttle, and no compression of files, so advertised speed = actually speed for incompressible data like UC 1080p HD.
Some older SATA 2 drives do better than new SATA 3's:
http://www.anandtech.com/show/4316/o...240gb-review/6
Compare the OZC Vertex 3 120Gb(161.9Mb/s ISWS) to the Corsair Nova 128Gb(184.3Mb/s ISWS).
The OZC Vertex 240(284.4Mb/s ISWS) is approved by BMD but not the 120Gb(161.9Mb/s ISWS).
LACK OF OS TRIM SUPPORT
The Kingston SSDNow V+100 128GB, which is approved for use by BMD, addresses the lack of OS TRIM support by the Shuttle.
AnandTech - Kingston SSDNow V+100 Review
Without these features, drives will need to be periodically secure erased, as the nature of SSD's is such that constant writing and erasing causes the drives to lose performance.
Secure erasing is the SSD equivalent of defragging, but all data is lost, not an issue for a media disk though.
Secure erasing can be quite a challenging and risky process for the inexperienced.
Experimenting with SE, I cooked 2 Force 60 drives that did not support SE and had to RMA them.
NEW GENERATION SPEED
SSD's with the latest generation of Sandforce controllers, have seriously high Sequential Write speeds, but the important spec is Incompressible Sequential Write speed which is significantly lower than the former.
AnandTech - The SandForce Roundup: Corsair, Kingston, Patriot, OCZ, OWC & MemoRight SSDs Compared
For example, the OZC Vertex 3 240Gb, which is also approved by BMD for the shuttle.
It has the new SATA 3 interface and has a Sequential Write speed of 480Mb/s, but an Incompressible SWS of 284.4Mb/s.
Since the Shuttle is SATA 2 the full performance benefits are not available to the Shuttle, nor will they be needed.
We only need to clear the hurdle of 134-161Mb/s ISWS to record 1080p 25-30fps.
However, the overhead of backward compatibilty of SATA 3 to 2, and the need to handle Incompressible files, reduces the performance of most of these new generation SSD's down to barely coping with 161mb/s ISWS.
SIZE
A further factor is the size of the SSD.
Due to SSD structure, 240Gb SSD's are double the speed(for Incompressible data) of 120Gb ones.
Again, the OZC Vertex 240 is approved by BMD but not the 120gb.
NAND
Lastly, some new SSD's use Aynchronous NAND , and others use Synchonous NAND which is faster.
It seems a 120Gb drive with the new Sandforce controller, and Synchronous NAND, will just scrape over the line to meet specs for 1080 30p, 161mb/s ISWS.
Whereas SSD's without Synchonous NAND, like the OZC Agility 3 120Gb, and Corsair Force 3 120Gb, will not make the grade.
The Kingston HyperX 120Gb does the job for UC HD 1080 25 and 30p recording from my camera.
The Corsair Force GT 120Gb (161.5Mb/s ISWS) has similar specs to the HyperX and so should be enough for UC HD 1080 30p as well.
TO SUM UP
SSD's with new Sandforce SF-2281 controllers, preferably 240Gb, (or 120Gb with Synchronous NAND), will do the job.
You will have to Secure Erase once performance drops.
Unless you get a Kingston SSDNow V+100 128GB(192mb/s ISWS), then always on garbage collection will free you from lower performance, (but at the expense of shortening the life of the drive).
Found these info on dvinfo.com forum:
BMD Hyperdeck FAQs:
The following SSD's are (re)commended for uncompressed video capture:
1.OCZ 240GB Vertex 3
2.OCZ 480GB Vertex 3
3.Crucial 256GB C300
4.Kingston 64GB SSDNow V+
5.Kingston 128GB SSDNow V+
OLD VS NEW
There may be good reasons for using older SSD's with Toshiba T6UG1XBG controllers as they have always on garbage collection that gets around the lack of OS TRIM support of the shuttle, and no compression of files, so advertised speed = actually speed for incompressible data like UC 1080p HD.
Some older SATA 2 drives do better than new SATA 3's:
http://www.anandtech.com/show/4316/o...240gb-review/6
Compare the OZC Vertex 3 120Gb(161.9Mb/s ISWS) to the Corsair Nova 128Gb(184.3Mb/s ISWS).
The OZC Vertex 240(284.4Mb/s ISWS) is approved by BMD but not the 120Gb(161.9Mb/s ISWS).
LACK OF OS TRIM SUPPORT
The Kingston SSDNow V+100 128GB, which is approved for use by BMD, addresses the lack of OS TRIM support by the Shuttle.
AnandTech - Kingston SSDNow V+100 Review
Without these features, drives will need to be periodically secure erased, as the nature of SSD's is such that constant writing and erasing causes the drives to lose performance.
Secure erasing is the SSD equivalent of defragging, but all data is lost, not an issue for a media disk though.
Secure erasing can be quite a challenging and risky process for the inexperienced.
Experimenting with SE, I cooked 2 Force 60 drives that did not support SE and had to RMA them.
NEW GENERATION SPEED
SSD's with the latest generation of Sandforce controllers, have seriously high Sequential Write speeds, but the important spec is Incompressible Sequential Write speed which is significantly lower than the former.
AnandTech - The SandForce Roundup: Corsair, Kingston, Patriot, OCZ, OWC & MemoRight SSDs Compared
For example, the OZC Vertex 3 240Gb, which is also approved by BMD for the shuttle.
It has the new SATA 3 interface and has a Sequential Write speed of 480Mb/s, but an Incompressible SWS of 284.4Mb/s.
Since the Shuttle is SATA 2 the full performance benefits are not available to the Shuttle, nor will they be needed.
We only need to clear the hurdle of 134-161Mb/s ISWS to record 1080p 25-30fps.
However, the overhead of backward compatibilty of SATA 3 to 2, and the need to handle Incompressible files, reduces the performance of most of these new generation SSD's down to barely coping with 161mb/s ISWS.
SIZE
A further factor is the size of the SSD.
Due to SSD structure, 240Gb SSD's are double the speed(for Incompressible data) of 120Gb ones.
Again, the OZC Vertex 240 is approved by BMD but not the 120gb.
NAND
Lastly, some new SSD's use Aynchronous NAND , and others use Synchonous NAND which is faster.
It seems a 120Gb drive with the new Sandforce controller, and Synchronous NAND, will just scrape over the line to meet specs for 1080 30p, 161mb/s ISWS.
Whereas SSD's without Synchonous NAND, like the OZC Agility 3 120Gb, and Corsair Force 3 120Gb, will not make the grade.
The Kingston HyperX 120Gb does the job for UC HD 1080 25 and 30p recording from my camera.
The Corsair Force GT 120Gb (161.5Mb/s ISWS) has similar specs to the HyperX and so should be enough for UC HD 1080 30p as well.
TO SUM UP
SSD's with new Sandforce SF-2281 controllers, preferably 240Gb, (or 120Gb with Synchronous NAND), will do the job.
You will have to Secure Erase once performance drops.
Unless you get a Kingston SSDNow V+100 128GB(192mb/s ISWS), then always on garbage collection will free you from lower performance, (but at the expense of shortening the life of the drive).
