Hello,
I have optimized my 16go USB stick by changing the clusters. Because the speed copy on PC change from 15 mb/s to 30 mb/s.
from the documentation:
This mountlist FSSM environment value can is really treated
as "FAT physical blocks" per "FAT sector" and be set to
a power of 2 to enforce a specific FAT sector size of 512,
1024, 2048, 4096 bytes, when multiplied with the physical
sector size of the underlying disk.
I'm using a 512 block on the key but a bigger cluster size.
The result is a requester who said:
volume has broken clusters geometry. can't mount it ?
- Please, first, add more clusters support for the next update.
- Remember me the clusters supported on AOS4 actually, thanks.
FAT32 and clusters
Re: FAT32 and clusters
You tried to mount a USB stick using a different cluster size, but don't re-formated it using that changed mountlist?
Re: FAT32 and clusters
Hello,
NO. I have formatted, using a PC tool (I think FAT32formatter),my 16go USB key. I could said more tomorow at job office. the tool is installed on the job office PC
the tool test the good cluster for the size of the FAT32 medias. I have increased the copy speed from 15mb to 25mb with this tool and I have finally formatted my USB key with this tool with the recommended high clusters.
Unfortunately, the key isn't recognized more on the amiga.
I have made that recently that mean I'm not sure the key work with update2.
More support of the size of clusters (FAT) will increase the speed copy.
NO. I have formatted, using a PC tool (I think FAT32formatter),my 16go USB key. I could said more tomorow at job office. the tool is installed on the job office PC
the tool test the good cluster for the size of the FAT32 medias. I have increased the copy speed from 15mb to 25mb with this tool and I have finally formatted my USB key with this tool with the recommended high clusters.
Unfortunately, the key isn't recognized more on the amiga.
I have made that recently that mean I'm not sure the key work with update2.
More support of the size of clusters (FAT) will increase the speed copy.
- tonyw
- AmigaOS Core Developer
- Posts: 1479
- Joined: Wed Mar 09, 2011 1:36 pm
- Location: Sydney, Australia
Re: FAT32 and clusters
I think you can assume that CrossDOS only supports the standard cluster size. It is unlikely to be expanded.
cheers
tony
tony
Re: FAT32 and clusters
I doubt if cluster size is the problem anyway. I ran some quick copy tests with 8 files totaling 116 MB. Here are my results with Update3 installed:tonyw wrote:I think you can assume that CrossDOS only supports the standard cluster size. It is unlikely to be expanded.
Copy from Ram: to USB mem stick formatted with FAT= 280 seconds
Copy from USB mem stick formatted with FAT to Ram:= 13 seconds
Copy from Ram: to USB mem stick formatted with SFS= 25 seconds
Copy from USB mem stick formatted with SFS to Ram:= 12 seconds
As you can see the FAT write speeds are unbelievably slow. My test with an SFS formatted mem stick indicates that the problem isn't with USB; the speed is far greater than I got with USB 1.1. Something appears to be wrong with CrossDosFilesystem because the write speed are comparable to USB 1.1 instead of USB 2.
AmigaOne X1000 with 2GB memory - OS4.1 FE
Re: FAT32 and clusters
Is CrossDOS using any cache buffers? Can these be specified?
Re: FAT32 and clusters
The support of the clusters should be expanded.
I could double the speed read and write on my 16go USB stick (FAT32 formatted).
Thanks to previous poster about speed test with FAT and SFS. I know It's a FAT32/CrossDOSfilesystem only now).
FAT32 support should be expanded to share datas easily with others platforms !!!!!
I could double the speed read and write on my 16go USB stick (FAT32 formatted).
Thanks to previous poster about speed test with FAT and SFS. I know It's a FAT32/CrossDOSfilesystem only now).
FAT32 support should be expanded to share datas easily with others platforms !!!!!