Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Disk density
Table title:
Overview
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Size </th><th colspan=2 rowspan=1 > 8-inch </th><th colspan=4 rowspan=1 > 5¼-inch </th><th colspan=5 rowspan=1 > 3½-inch </th></tr>
<tr> <th colspan=1 rowspan=1 > Density </th><th colspan=1 rowspan=1 > SD </th><th colspan=1 rowspan=1 > DD </th><th colspan=1 rowspan=1 > SD </th><th colspan=1 rowspan=1 > DD </th><th colspan=1 rowspan=1 > QD </th><th colspan=1 rowspan=1 > HD </th><th colspan=2 rowspan=1 > DD </th><th colspan=1 rowspan=1 > HD </th><th colspan=1 rowspan=1 > ED </th><th colspan=1 rowspan=1 > TD </th></tr>
<tr> <th colspan=1 rowspan=1 > Disk coating </th><td colspan=5 rowspan=1 > Iron oxide </td><td colspan=1 rowspan=1 > Cobalt </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > Iron oxide, Cobalt? </td><td colspan=1 rowspan=1 > Cobalt </td><td colspan=1 rowspan=1 > Barium ferrite </td><td colspan=1 rowspan=1 > ? </td></tr>
<tr> <th colspan=1 rowspan=1 > Coercivity [Oe] </th><td colspan=5 rowspan=1 > 290, 300 </td><td colspan=1 rowspan=1 > 600, 660, 670 </td><td colspan=1 rowspan=1 > ca. 600 </td><td colspan=1 rowspan=1 > 600?, 660, 670 </td><td colspan=1 rowspan=1 > 700, 720 </td><td colspan=1 rowspan=1 > 750?, 1060, 1200 </td><td colspan=1 rowspan=1 > ? </td></tr>
<tr> <th colspan=1 rowspan=1 > Coating thickness [µ-inch] </th><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > 100, 2.5 µm, 2.0-3.0 µm </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > 55, 1.3 µm, 1.0-1.5 µm </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > 65, 1.9 µm, 2.0-3.0 µm </td><td colspan=1 rowspan=1 > 55, 0.9 µm, 1.0-1.5 µm </td><td colspan=1 rowspan=1 > ? </td><td colspan=1 rowspan=1 > ? </td></tr>
<tr> <th colspan=1 rowspan=1 > Line code </th><td colspan=1 rowspan=1 > FM </td><td colspan=1 rowspan=1 > MFM, M²FM, FM/MFM or GCR </td><td colspan=1 rowspan=1 > FM </td><td colspan=2 rowspan=1 > MFM or GCR </td><td colspan=1 rowspan=1 > MFM </td><td colspan=1 rowspan=1 > MFM </td><td colspan=1 rowspan=1 > MFM or GCR </td><td colspan=3 rowspan=1 > MFM </td></tr>
<tr> <th colspan=1 rowspan=1 > Track width </th><td colspan=4 rowspan=1 > 0.330 mm </td><td colspan=2 rowspan=1 > 0.160 mm </td><td colspan=1 rowspan=1 > ? </td><td colspan=3 rowspan=1 > 0.115 mm </td><td colspan=1 rowspan=1 > ? </td></tr>
<tr> <th colspan=1 rowspan=1 > Track density [tpi] </th><td colspan=4 rowspan=1 > 48 </td><td colspan=1 rowspan=1 > 96 or 100 </td><td class="highlighted"  colspan=1 rowspan=1 > 96 </td><td colspan=1 rowspan=1 > 67.5 </td><td colspan=3 rowspan=1 > 135 </td><td colspan=1 rowspan=1 > 406.5 </td></tr>
<tr> <th colspan=1 rowspan=1 > Bit density [bpi] </th><td colspan=5 rowspan=1 > 5876, 5922 </td><td class="highlighted"  colspan=1 rowspan=1 > 9646, 9870 </td><td colspan=1 rowspan=1 > 8650 </td><td colspan=1 rowspan=1 > 8717 </td><td colspan=1 rowspan=1 > 17432, 17434 </td><td colspan=1 rowspan=1 > 34868 </td><td colspan=1 rowspan=1 > 36700 </td></tr>
<tr> <th colspan=1 rowspan=1 > Recording direction </th><td colspan=9 rowspan=1 > longitudinal / horizontal </td><td colspan=1 rowspan=1 > perpendicular / vertical </td></tr>
</table>
Question:
What's the tpi and bpi of HD?
Answer:
High density (HD) utilizes a 96 tpi track density allowing 9646 bpi.