24 October 2017, 17:48 | #1 |
Electronics Engineer
Join Date: May 2017
Location: Swansea, UK
Age: 44
Posts: 11
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Some HD Toolbox Questions
Amiga fans,
I am quite used to setting up hard drives on the AMIGA and I know what to do. But I am aware that I don't understand some of the settings I make - I simply learned to make those settings from other people. I would like to ask my fellow Amiga fans to help me to dispel my ignorance.
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24 October 2017, 18:18 | #2 | ||||
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Join Date: Jan 2002
Location: Germany
Posts: 6,985
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Quote:
Quote:
Quote:
0x1fe00 is 255 times 512. The ATA bus can transfer a maximum of 256 blocks of 512 bytes. This would be 0x20000. One reduces the value by one block for safety. Quote:
If the file system limits the partition size by a maximum number of blocks, you can also increase the partition size limit by specifying larger blocks. Especially when it comes to flash memory and SSDs it might be a good idea to align file system blocks to physical sectors. |
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25 October 2017, 09:15 | #3 |
Electronics Engineer
Join Date: May 2017
Location: Swansea, UK
Age: 44
Posts: 11
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Thanks very much indeed for your response Thomas!
I am satisfied with the answers to my 3rd and 4th questions, and I am happy that I understand it now. I still don't feel like I fully understand the identifier or mask but your response has given me something to go on. I'll read into it based on what you've told me and try to further my understanding before I post any follow-up questions Thanks for sharing your knowledge. |
25 October 2017, 10:48 | #4 |
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Join Date: Jan 2005
Location: UmeƄ
Age: 43
Posts: 922
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The Mask is also used to circumvent bugs/limits in the driver/hardware. It should be 0xFFFFFFFF unless there is a bug/limit.
The file system will do a bitwise and with the Mask and the address of the buffer used for a read/write and if the result doesnt match the address, it will transfer data via an intermediary buffer in “safe” memory, usually chip memory - very slow both because of extra copy and slow chip memory. An example can be if the driver+hardware does not handle transfers to/from odd addresses, then you can set the Mask to 0xFFFFFFFE to mask away odd addresses, forcing the “safe” transfer for those. Another example can be if the driver driver+hardware doesn’t handle transfers to memory above Zorro2 space (first 16MB), then you can set Mask to 0xFFFFFF to mask such addresses away, forcing “safe” transfers for them. You can also of course combine the above to 0xFFFFFE to mask away both odd addresses and addresses above Zorro2 space. |
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