Thió ió aî extracô oæ aî articlå iî Dr®  Dobb's¬  Apriì 1981. Thió prograí requireó á Z8° MPU¬  aô leasô 32Ë bytå RAÍ memory, two flexible disk drives and CP/M 2.x. Alì  consolå  I/Ï  ió  donå  usinç  thå  standarä  CP/Í functioî calls®  Foò maximuí tesô speed¬ accesó tï protecteä systeí  areaó anä tï avoiä erroò interceptioî bù CP/M¬  disë I/O is performed directly by calls to the BIOS drivers. Thå  prograí  ió configureä tï tesô  á  sofô  sectored¬ singlå densitù disë witè 7· tracks¬ 2¶ sectoró peò tracë anä 12¸ bytå sectors®  Iæ yoõ arå usinç á differenô typå oæ disë drive¬  thå numbeò oæ trackó and/oò sectoró peò tracë maù bå specifieä  durinç thå initializatioî dialog¬  oò thå prograí may be reassembled to modify the default configuration. Thå  prograí doeó noô exhaustivelù checë ouô thå  drivå anä  anù erroró detecteä bù thå prograí musô bå  interpreteä witè care® Intermittenô erroró occurrinç throughouô á broaä rangå  oæ disë addresseó probablù indicateó á  probleí  witè thå   disë  drivå  unit®   Erroró  indicateä  aô  consistenô addresseó  withiî  adjacenô trackó maù resulô froí  worî  oò damageä  disk®  Error-freå executioî oæ thå  tesô  certainlù indicates an intact and useable diskette. NOTEº  thå  prograí  ió  ratheò  insensitivå  tï  drivå problemó  relateä  tï  heaä movemenô sincå thå  diskettå  ió addressed in a smooth sequential manner. ERROR LISTING Erroró  detecteä bù thå prograí maù bå itemizeä oî  thå systeí consolå oò thå linå printer®  Thå pass¬  drivå  name¬ tracë  anä sectoò wherå thå erroò occurreä arå  listed®  Alì numberó arå iî decimal®  Thå erroò typå ió designateä aô thå right® Iî thå explanationó below¬ 'hardwarå error§ signifieó aî  erroò statuó codå passeä froí thå low-leveì disë  driveò and usually means a CRC fault or seek incomplete. ERROR TYPE EXPLANATION ============================================================ reaä erroò - originaì datá Iæ runninç iî restorå  mode¬ hardwarå reaä erroò noteä aó the original data was being loaded into memory. write error - test data Hardware error noted as the test data pattern was being written on the diskette. read error - test data Hardware error noted as the test data pattern was being read back from the diskette. Š compare error - test data Difference was found between the data pattern that was written to the diskette and the data that was read back. write error - restore phase Hardware error noted as the original data was being written back to the diskette. read error - restore phase Hardware error noted as the restored original data was beinç reaä bacë foò verification. datá cannoô bå restoreä Comparå erroò founä betweeî thå originaì datá rewritteî tï thå diskettå anä thå samå sectors read back for verification.  .