Record pointers

JCW2
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In this problem can you explain the record pointer (pr)?
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Top Expert 2014
Commented:
for each key value in the index, you also have a 7-byte pointer to the start of the actual record.  So each index entry is 16 bytes.  Each file system may require different pointer layout (usually track, sector, offset).

If this were a non-unique index, you might have multiple 7-byte pointers for a given key value.
"In this problem can you explain the record pointer (pr)"
the pr is the specific address of the start of the relevent record.

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Thank you for your help.

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