Raspberry Pi Getting Started Guide
Page 8
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
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Print card info:
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Command (m for help): p
Disk /dev/sdb: 128 MB, 128450560 bytes
....
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Make a note of the card size in bytes. You will need it later.
Then go into "Expert mode":
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Command (m for help): x
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Now we want to set the geometry to 255 heads, 63 sectors and calculate the number of cylinders
required for the particular SD/MMC card:
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Expert command (m for help): h
Number of heads (1-256, default 4): 255
Expert command (m for help): s
Number of sectors (1-63, default 62): 63
Warning: setting sector offset for DOS compatiblity
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NOTE: Be especially careful in the next step. First calculate the number of cylinders as follows:
C = B / 255 / 63 / 512 where
B = Card size in bytes (The number you wrote down earlier.)
C = Number of cylinders
When you get the number, round it DOWN. Thus, if you got C = 108.8 you'll be using 108 cylinders.
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Expert command (m for help): c
Number of cylinders (1-1048576, default 1011): 15
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