[mkgmap-dev] Automatic block-size setting

Sat Jan 20 15:45:03 GMT 2018

Hi Steve,

it was my first impression, that MDR got only big blocks, but you are 
right, there are all sizes used. Now that I have looked more carefully, 
I see some inconsistency. MDR img has always the same structure, I would 
suspect, that block size increase with file size, but it is not true. 
See list of my files sorted by img size:

File:		SAmTopo_mdr.img, length 176291840
fat:		400h - 600h - 6200h, block 16384

File:		SAmOTBR_mdr.img, length 113917952
fat:		400h - 600h - 7C00h, block 8192

File:		AfricaHR_mdr.img, length 56901632
fat:		400h - 600h - 2600h, block 16384

File:		SAmOTS_mdr.img, length 35307520
fat:		400h - 600h - 2C00h, block 8192

File:		SAmOTN_mdr.img, length 18628608
fat:		400h - 600h - 1C00h, block 8192

File:		SAmOTEC_mdr.img, length 17248256
fat:		400h - 600h - 2C00h, block 4096

File:		AfricaN_mdr.img, length 13844480
fat:		400h - 600h - 1800h, block 8192

File:		AfricaS_mdr.img, length 11411456
fat:		400h - 600h - 2000h, block 4096

File:		AfricaW_mdr.img, length 8376320
fat:		400h - 600h - 1A00h, block 4096

File:		AfricaC_mdr.img, length 7897088
fat:		400h - 600h - 1A00h, block 4096

File:		AfricaE_mdr.img, length 6871040
fat:		400h - 600h - 2400h, block 2048

File:		AfricaSE_mdr.img, length 4153344
fat:		400h - 600h - 1A00h, block 2048

File:		AfricaSW_mdr.img, length 3403776
fat:		400h - 600h - 1000h, block 4096

File:		AfricaNE_mdr.img, length 2904064
fat:		400h - 600h - E00h, block 4096

Probably something unimportant, but a bit surprising.

-- 
Best regards,
Andrzej