====== HEA: and MAX: values for BRU ======

From page 41 of the [[http://bitsavers.org/pdf/dec/pdp11/rsx11m_plus/RSX11Mplus_V4.x/2a/AA-H431H-TC_RSX-11M-PLUS_4.3_System_Generation_and_Installation_Guide_Jan90.pdf|RSX-11M-PLUS 4.3 System Generation and Installation Guide]], the following values are known-safe for the ''HEA:'' and ''MAX:'' flags when initializing a disk.

^ Device  ^ MAX:   ^ HEA:   |
| RA60    | 24617  | 12308  |
| RA70    | 34180  | 25593  |
| RA80    | 14629  | 7314   |
| RA81    | 54815  | 51699  |
| RA82    | 65500  | 51699  |
| RA90    | 65500  | 65495  |
| RC25    | 3130   | 1565   |
| RD31    | 2558   | 10236  |
| RD32    | 5117   | 20471  |
| RD52    | 3719   | 1859   |
| RD53    | 8529   | 4264   |
| RD54    | 19143  | 9571   |
| RK07    | 3308   | 1654   |
| RM0{2,3} | 8099  | 4049   |
| RM05    | 30781  | 25593  |
| RM80    | 14923  | 7461   |
| RP0{4,5} | 10567 | 5283   |
| RP06    | 20956  | 10478  |

Section 4.6.6 (page 85) of the November 1998 revision of [[https://vt100.net/dec/aa-2573p-tc.pdf|RSX-11M/RSX-11S Release Notes]] contains guidance on how to determine appropriate values for disks of arbitrary size. I have paraphrased this information for the sake of brevity, if something is not clear please refer to the documentation itself.

To determine the maximum value for ''MAX:'', follow these guidelines:
  * For disks up to 64MB in size, ''%%MAXIMUM FILES = ((N-(((N+4095.)/4096.)+9.))*127.)/258.%%'' where ''N'' is the size of your target disk
  * For disks from 64MB to 532MB, set ''MAX:'' to the number of blocks on disk divided by 16.
  * For disks larger than 532MB, set ''MAX:'' to 65500.

The value of ''HEA:'' is derived from the value of ''MAX:''. In order to determine the maximum ''HEA:'' value for your disk, use the following guidelines:

<code>
MAX value ---------- disk size ---------- HEA value
<25588               ≤209MB               MAX/2
≥25588 ^ ≤51176      210-419MB            25593
≥51176 ^ ≤51693      420-423MB            25846
≥51693 ^ ≤65500      ≥423MB               51693
</code>