What is Sufficient Donor Hair?

what do you mean by “sufficient donor hair” …any link where there is a pic differentating between “sufficient donor hair” and “insufficient donor hair”?

Hair transplantation requires that the supply of hair is more than adeqaute to meet the demand for hair. The smaller the balding area, the less will be the requirement for donor hair. There is also a ‘must’ where the donor hair must be in adequate quantities (density) and adequate quality (healthy). Low densities or poor quality of donor hair (the presence of Diffuse Unpatterned Alopecia, for example) means that the donor supply is insufficient to support a hair transplant.