diff --git a/projects/dataforth-dos/batch-files/DEPLOY.BAT b/projects/dataforth-dos/batch-files/DEPLOY.BAT
index c271abe..5c3a034 100644
--- a/projects/dataforth-dos/batch-files/DEPLOY.BAT
+++ b/projects/dataforth-dos/batch-files/DEPLOY.BAT
@@ -1,8 +1,8 @@
 @ECHO OFF
 REM One-time deployment script for DOS Update System
 REM Usage: T:\COMMON\ProdSW\DEPLOY.BAT machine-name
-REM Version: 2.4 - Use COPY instead of XCOPY (DOS 6.22 compatibility)
-REM Last modified: 2026-01-21
+REM Version: 4.1 - Fixed trailing space bug in ECHO >> redirects
+REM Last modified: 2026-03-12
 
 CLS
 
@@ -13,7 +13,7 @@ REM Save machine name
 SET MACHINE=%1
 
 ECHO ==============================================================
-ECHO DOS Update System - Deployment
+ECHO DOS Update System - Deployment v4.1
 ECHO ==============================================================
 ECHO Machine: %MACHINE%
 ECHO ==============================================================
@@ -22,52 +22,89 @@ ECHO Press any key to install...
 PAUSE >NUL
 ECHO.
 
-REM Create directories (ignore errors with >NUL)
+REM Create local directories
 MD C:\BAT >NUL
-MD T:\%MACHINE% >NUL
+MD C:\BATCH >NUL
+MD C:\TEMP >NUL
+MD C:\ATE >NUL
+MD C:\NET >NUL
 
-ECHO (1/2) Copying batch files to C:\BAT...
-COPY T:\COMMON\ProdSW\NWTOC.BAT C:\BAT >NUL
-COPY T:\COMMON\ProdSW\CTONW.BAT C:\BAT >NUL
-COPY T:\COMMON\ProdSW\UPDATE.BAT C:\BAT >NUL
-COPY T:\COMMON\ProdSW\CHECKUPD.BAT C:\BAT >NUL
-COPY T:\COMMON\ProdSW\STAGE.BAT C:\BAT >NUL
-COPY T:\COMMON\ProdSW\REBOOT.BAT C:\BAT >NUL
+ECHO (1/3) Copying batch files to C:\BAT...
+COPY T:\COMMON\ProdSW\*.BAT C:\BAT >NUL
 ECHO      Batch files installed
 ECHO.
 
-ECHO (2/2) Installing AUTOEXEC.BAT...
-REM Create AUTOEXEC.BAT with machine name
-ECHO @ECHO OFF > C:\AUTOEXEC.BAT
-ECHO REM Dataforth Test Machine - DOS 6.22 >> C:\AUTOEXEC.BAT
-ECHO SET MACHINE=%MACHINE% >> C:\AUTOEXEC.BAT
-ECHO SET PATH=C:\DOS;C:\NET;C:\BAT;C:\BATCH;C:\ >> C:\AUTOEXEC.BAT
-ECHO PROMPT $P$G >> C:\AUTOEXEC.BAT
-ECHO SET TEMP=C:\TEMP >> C:\AUTOEXEC.BAT
-ECHO SET TMP=C:\TEMP >> C:\AUTOEXEC.BAT
-ECHO MD C:\TEMP >NUL >> C:\AUTOEXEC.BAT
-ECHO CLS >> C:\AUTOEXEC.BAT
-ECHO ECHO. >> C:\AUTOEXEC.BAT
-ECHO ECHO Dataforth Test Machine: %MACHINE% >> C:\AUTOEXEC.BAT
-ECHO ECHO. >> C:\AUTOEXEC.BAT
-ECHO IF EXIST C:\STARTNET.BAT CALL C:\STARTNET.BAT >> C:\AUTOEXEC.BAT
-ECHO IF NOT EXIST T:\*.* GOTO NONET >> C:\AUTOEXEC.BAT
-ECHO IF EXIST C:\BAT\NWTOC.BAT CALL C:\BAT\NWTOC.BAT >> C:\AUTOEXEC.BAT
-ECHO IF EXIST C:\BAT\CTONW.BAT CALL C:\BAT\CTONW.BAT >> C:\AUTOEXEC.BAT
-ECHO GOTO READY >> C:\AUTOEXEC.BAT
-ECHO :NONET >> C:\AUTOEXEC.BAT
-ECHO ECHO ERROR: Network not available >> C:\AUTOEXEC.BAT
-ECHO :READY >> C:\AUTOEXEC.BAT
-ECHO ECHO. >> C:\AUTOEXEC.BAT
-ECHO ECHO System Ready >> C:\AUTOEXEC.BAT
-ECHO ECHO. >> C:\AUTOEXEC.BAT
-ECHO CD \ATE >> C:\AUTOEXEC.BAT
-ECHO menux >> C:\AUTOEXEC.BAT
+ECHO (2/3) Creating machine directory on network...
+MD T:\%MACHINE% >NUL
+MD T:\%MACHINE%\LOGS >NUL
+MD T:\%MACHINE%\LOGS\5BLOG >NUL
+MD T:\%MACHINE%\LOGS\7BLOG >NUL
+MD T:\%MACHINE%\LOGS\8BLOG >NUL
+MD T:\%MACHINE%\LOGS\DSCLOG >NUL
+MD T:\%MACHINE%\LOGS\HVLOG >NUL
+MD T:\%MACHINE%\LOGS\PWRLOG >NUL
+MD T:\%MACHINE%\LOGS\SCTLOG >NUL
+MD T:\%MACHINE%\LOGS\VASLOG >NUL
+MD T:\%MACHINE%\Reports >NUL
+MD T:\%MACHINE%\BACKUP >NUL
+ECHO      Network directories created
+ECHO.
+
+ECHO (3/3) Installing AUTOEXEC.BAT...
+REM Create AUTOEXEC.BAT with machine name - no IF EXIST checks
+REM NOTE: Redirect BEFORE echo to avoid trailing spaces in output
+REM First line uses > to overwrite, rest use >> to append
+>C:\AUTOEXEC.BAT ECHO @ECHO OFF
+>>C:\AUTOEXEC.BAT ECHO REM Dataforth Test Machine Startup - DOS 6.22
+>>C:\AUTOEXEC.BAT ECHO REM Version: 4.1 - No IF EXIST checks
+>>C:\AUTOEXEC.BAT ECHO REM Deployed: 2026-03-12
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO SET MACHINE=%MACHINE%
+>>C:\AUTOEXEC.BAT ECHO SET PATH=C:\DOS;C:\NET;C:\BAT;C:\BATCH;C:\
+>>C:\AUTOEXEC.BAT ECHO PROMPT $P$G
+>>C:\AUTOEXEC.BAT ECHO SET TEMP=C:\TEMP
+>>C:\AUTOEXEC.BAT ECHO SET TMP=C:\TEMP
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO CLS
+>>C:\AUTOEXEC.BAT ECHO ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO ==============================================================
+>>C:\AUTOEXEC.BAT ECHO ECHO   Dataforth Test Machine: %MACHINE%
+>>C:\AUTOEXEC.BAT ECHO ECHO   AUTOEXEC v4.1 - 2026-03-12
+>>C:\AUTOEXEC.BAT ECHO ECHO ==============================================================
+>>C:\AUTOEXEC.BAT ECHO ECHO.
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO MD C:\TEMP >NUL
+>>C:\AUTOEXEC.BAT ECHO MD C:\BAT >NUL
+>>C:\AUTOEXEC.BAT ECHO MD C:\BATCH >NUL
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO Starting network client...
+>>C:\AUTOEXEC.BAT ECHO ECHO.
+>>C:\AUTOEXEC.BAT ECHO CALL C:\STARTNET.BAT
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO Network Drives:
+>>C:\AUTOEXEC.BAT ECHO ECHO   T: = \\D2TESTNAS\test
+>>C:\AUTOEXEC.BAT ECHO ECHO   X: = \\D2TESTNAS\datasheets
+>>C:\AUTOEXEC.BAT ECHO ECHO.
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO Checking for software updates...
+>>C:\AUTOEXEC.BAT ECHO CALL C:\BAT\NWTOC.BAT
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO Uploading test data to network...
+>>C:\AUTOEXEC.BAT ECHO CALL C:\BAT\CTONW.BAT
+>>C:\AUTOEXEC.BAT ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO.
+>>C:\AUTOEXEC.BAT ECHO ECHO ==============================================================
+>>C:\AUTOEXEC.BAT ECHO ECHO System Ready
+>>C:\AUTOEXEC.BAT ECHO ECHO ==============================================================
+>>C:\AUTOEXEC.BAT ECHO ECHO.
+>>C:\AUTOEXEC.BAT ECHO CD \ATE
+>>C:\AUTOEXEC.BAT ECHO menux
 ECHO      AUTOEXEC.BAT installed with MACHINE=%MACHINE%
 ECHO.
 
 ECHO ==============================================================
-ECHO Deployment Complete - REBOOT NOW
+ECHO Deployment Complete v4.1 - REBOOT NOW
 ECHO ==============================================================
 ECHO.
 PAUSE
diff --git a/projects/dataforth-dos/session-logs/2026-03-12-session.md b/projects/dataforth-dos/session-logs/2026-03-12-session.md
index b2728a9..748a3c4 100644
--- a/projects/dataforth-dos/session-logs/2026-03-12-session.md
+++ b/projects/dataforth-dos/session-logs/2026-03-12-session.md
@@ -271,9 +271,96 @@ Ran script to create LOGS/5BLOG, LOGS/7BLOG, LOGS/8BLOG, LOGS/DSCLOG, LOGS/HVLOG
 - Snapshot transfer stopped (was at ~43GB logical), needs restart after data completes
 
 ### Pending
-1. Reboot a DOS machine to test v4.0 batch files
-2. Monitor data transfer completion
+1. Reboot a DOS machine to test v4.0 batch files (second boot needed for NWTOC v4.0)
+2. Monitor data transfer completion (rsync single stream still running as of ~20:00)
 3. Restart snapshot transfer after data completes
 4. Verify test data appears in correct LOGS subdirectories on NAS
 5. Set up AD2 scheduled task for rsync sync
 6. Run real (non-dry) Sync-FromNAS-rsync.ps1 on AD2
+
+## Update: ~20:00 - DEPLOY Trailing Space Bug and Data Upload Success
+
+### Critical Bug Found: DEPLOY.BAT Trailing Space
+- **Root cause of ALL "Too many parameters" errors**: `ECHO SET MACHINE=%MACHINE% >> C:\AUTOEXEC.BAT` includes the space before `>>` in the output
+- This sets `MACHINE=TS-3L ` (with trailing space) which causes `T:\TS-3L \LOGS\DSCLOG` to be parsed as two parameters
+- **Fix**: DEPLOY v4.1 moves redirect before ECHO: `>>C:\AUTOEXEC.BAT ECHO SET MACHINE=%MACHINE%`
+- First line uses `>` (overwrite), rest use `>>` (append)
+- DEPLOY v4.1 deployed to NAS at `/data/test/COMMON/ProdSW/DEPLOY.BAT`
+
+### Samba Case Sensitivity - Confirmed OK
+- `smb.conf` has `case sensitive = no` and `default case = upper`
+- No duplicate directories (only `TS-4L` exists, not `ts-4L`)
+
+### TS-3L Deploy Test
+- Ran `T:\UPDATE TS-3L` which calls DEPLOY v4.0 (before trailing space fix)
+- DEPLOY completed, files confirmed v4.0 on machine via TYPE
+- After reboot: NAS still showed old CTONW.LOG/NWTOC.LOG - MACHINE had trailing space
+- Running CTONW manually showed 9x "Too many parameters" on all COPY-to-subdirectory lines
+- `COPY C:\ATE\*.LOG T:\%MACHINE%` worked (no subdirectory in path) but `COPY ... T:\%MACHINE%\LOGS\DSCLOG` failed
+- This confirmed the trailing space theory - space before `\LOGS\` splits the path
+
+### TS-4L Data Upload - SUCCESS
+- TS-4L uploaded data at 20:10 with clean MACHINE variable (no trailing space)
+- **84 test data files uploaded to NAS:**
+  - 5BLOG: 20 files
+  - 7BLOG: 29 files (historical .SHT files)
+  - 8BLOG: 10 files
+  - DSCLOG: 21 files (including today's 38-02.DAT from 03-12-26)
+  - SCTLOG: 2 files
+  - VASLOG: 2 files
+- **90+ work-order Reports** (.TXT files) uploaded to TS-4L/Reports/
+- **3 LOG files** (NWTOC.LOG, CTONW.LOG, CTONWTXT.LOG)
+- CTONW.LOG confirms: `CTONW.BAT v4.0 / Machine: TS-4L` (no trailing space)
+
+### Original STARTNET.BAT Found (from TS-3L backup)
+The actual STARTNET.BAT on DOS machines loads network drivers manually:
+```
+LH /L:0;1,45472 /S c:\net\smartdrv.exe /q
+c:\net\net initialize
+c:\net\netbind.com
+lh c:\net\umb.com
+c:\net\tcptsr.exe
+c:\net\tinyrfc.exe
+c:\net\nmtsr.exe
+c:\net\emsbfr.exe
+c:\net\net start
+net use T: \\d2testnas\test
+net use X: \\d2testnas\datasheets
+```
+- `net start` prompts for computer name (pre-populated from SYSTEM.INI)
+- Could add `/y` flag to suppress prompt, or use MACHINE variable
+- Our v2.0 STARTNET.BAT on ProdSW is a simplified rewrite that was never deployed to machines
+
+### T:\UPDATE.BAT
+- Tiny 4-line wrapper at root of test share: `CALL T:\COMMON\ProdSW\DEPLOY.BAT %1`
+- Allows running `T:\UPDATE TS-3L` from DOS machines
+
+### Rsync Transfer Status
+- Single stream still running from old NAS (.117) to new VM (.9)
+- Snapshot transfer still pending restart
+
+### Files Modified This Update
+- `D:\ClaudeTools\projects\dataforth-dos\batch-files\DEPLOY.BAT` - v4.1 (trailing space fix)
+- Deployed to NAS at `/data/test/COMMON/ProdSW/DEPLOY.BAT`
+
+---
+
+## Pending/Incomplete Tasks (Updated)
+
+### Immediate
+1. **Re-deploy TS-3L with DEPLOY v4.1** - needs new deploy + reboot to fix trailing space
+2. **Set up AD2 rsync scheduled task** - Sync-FromNAS-rsync.ps1 deployed but no task created (15-min interval planned)
+3. **Run real (non-dry) sync** of Sync-FromNAS-rsync.ps1 on AD2
+4. **Database ingestion pipeline** - No ingestion exists yet. Data flows: NAS -> AD2 -> MariaDB @ 172.16.3.30
+
+### After Data Transfer Complete
+5. **Monitor old NAS rsync completion** - single stream still running
+6. **Restart snapshot transfer** after data completes
+7. **Verify data integrity** - compare file counts between old and new NAS
+8. **Power off old NAS** once confirmed
+
+### Batch File Updates Needed
+9. **UPDATE.BAT** (in ProdSW) - has IF EXIST checks, needs v4.0 treatment
+10. **ATESYNC.BAT / ATESYNCD.BAT** - have IF EXIST checks, need v4.0 treatment (not currently called by AUTOEXEC)
+11. **STARTNET.BAT** - consider deploying updated version or adding `/y` to suppress net start prompt
+12. **AV exclusions on AD2** - add exclusions for C:\Shares\test\ and rsync.exe